/*
* Cppcheck - A tool for static C/C++ code analysis
* Copyright (C) 2007-2010 Daniel Marjamäki and Cppcheck team.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "tokenize.h"
#include "checkbufferoverrun.h"
#include "testsuite.h"
#include <sstream>
#include <climits>
extern std::ostringstream errout;
class TestBufferOverrun : public TestFixture
{
public:
TestBufferOverrun() : TestFixture("TestBufferOverrun")
{ }
private:
void check(const char code[], bool showAll = true)
{
// Tokenize..
Tokenizer tokenizer;
std::istringstream istr(code);
tokenizer.tokenize(istr, "test.cpp");
// Assign variable ids
tokenizer.simplifyTokenList();
// Fill function list
tokenizer.fillFunctionList();
// Clear the error buffer..
errout.str("");
// Check for buffer overruns..
Settings settings;
settings.inconclusive = showAll;
settings._checkCodingStyle = true;
CheckBufferOverrun checkBufferOverrun(&tokenizer, &settings, this);
checkBufferOverrun.bufferOverrun();
checkBufferOverrun.negativeIndex();
}
void run()
{
TEST_CASE(noerr1);
TEST_CASE(noerr2);
TEST_CASE(noerr3);
TEST_CASE(noerr4);
TEST_CASE(sizeof1);
TEST_CASE(sizeof2);
TEST_CASE(sizeof3);
TEST_CASE(arrayInfo);
TEST_CASE(array_index_1);
TEST_CASE(array_index_2);
TEST_CASE(array_index_3);
TEST_CASE(array_index_4);
TEST_CASE(array_index_5);
TEST_CASE(array_index_6);
TEST_CASE(array_index_7);
TEST_CASE(array_index_8);
TEST_CASE(array_index_9);
TEST_CASE(array_index_10);
TEST_CASE(array_index_11);
TEST_CASE(array_index_12);
TEST_CASE(array_index_13);
TEST_CASE(array_index_14);
TEST_CASE(array_index_15);
TEST_CASE(array_index_16);
TEST_CASE(array_index_17);
TEST_CASE(array_index_18);
TEST_CASE(array_index_19);
TEST_CASE(array_index_20);
TEST_CASE(array_index_21);
TEST_CASE(array_index_22);
TEST_CASE(array_index_23);
TEST_CASE(array_index_24); // ticket #1492 and #1539
TEST_CASE(array_index_25); // ticket #1536
TEST_CASE(array_index_26);
TEST_CASE(array_index_27);
TEST_CASE(array_index_28); // ticket #1418
TEST_CASE(array_index_29); // ticket #1734
TEST_CASE(array_index_multidim);
TEST_CASE(array_index_switch_in_for);
TEST_CASE(array_index_calculation);
TEST_CASE(array_index_negative);
TEST_CASE(array_index_for_decr);
TEST_CASE(array_index_varnames); // FP: struct member. #1576
TEST_CASE(buffer_overrun_1);
TEST_CASE(buffer_overrun_2);
TEST_CASE(buffer_overrun_3);
TEST_CASE(buffer_overrun_4);
TEST_CASE(buffer_overrun_5);
TEST_CASE(buffer_overrun_6);
TEST_CASE(buffer_overrun_7);
TEST_CASE(buffer_overrun_8);
TEST_CASE(buffer_overrun_9);
TEST_CASE(buffer_overrun_10);
TEST_CASE(buffer_overrun_11);
TEST_CASE(buffer_overrun_12);
TEST_CASE(buffer_overrun_13);
TEST_CASE(buffer_overrun_14);
TEST_CASE(buffer_overrun_15); // ticket #1787
TEST_CASE(sprintf1);
TEST_CASE(sprintf2);
TEST_CASE(sprintf3);
TEST_CASE(sprintf4);
TEST_CASE(sprintf5);
TEST_CASE(sprintf6);
TEST_CASE(sprintf7);
TEST_CASE(sprintf8);
TEST_CASE(snprintf1);
TEST_CASE(snprintf2);
TEST_CASE(snprintf3);
TEST_CASE(snprintf4);
TEST_CASE(snprintf5);
TEST_CASE(snprintf6);
TEST_CASE(strncat1);
TEST_CASE(strncat2);
TEST_CASE(strncat3);
TEST_CASE(strcat1);
TEST_CASE(strcat2);
TEST_CASE(memfunc); // memchr/memset/memcpy
TEST_CASE(varid1);
TEST_CASE(varid2);
TEST_CASE(assign1);
TEST_CASE(alloc1); // Buffer allocated with new
TEST_CASE(alloc2); // Buffer allocated with malloc
TEST_CASE(memset1);
TEST_CASE(memset2);
TEST_CASE(counter_test);
TEST_CASE(strncpy1);
TEST_CASE(unknownType);
TEST_CASE(terminateStrncpy1);
TEST_CASE(terminateStrncpy2);
TEST_CASE(recursive_long_time);
TEST_CASE(crash); // Ticket #1587 - crash
TEST_CASE(executionPaths1);
TEST_CASE(executionPaths2);
TEST_CASE(cmdLineArgs1);
}
void noerr1()
{
check("extern int ab;\n"
"void f()\n"
"{\n"
" if (ab)\n"
" {\n"
" char str[50];\n"
" }\n"
" if (ab)\n"
" {\n"
" char str[50];\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void noerr2()
{
check("static char buf[2];\n"
"void f1(char *str)\n"
"{\n"
" strcpy(buf,str);\n"
"}\n"
"void f2(char *str)\n"
"{\n"
" strcat(buf,str);\n"
"}\n"
"void f3(char *str)\n"
"{\n"
" sprintf(buf,\"%s\",str);\n"
"}\n"
"void f4(const char str[])\n"
"{\n"
" strcpy(buf, str);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void noerr3()
{
check("struct { char data[10]; } abc;\n"
"static char f()\n"
"{\n"
" char data[1];\n"
" return abc.data[1];\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void noerr4()
{
// The memory isn't read or written and therefore there is no error.
check("static void f()\n"
"{\n"
" char data[100];\n"
" const char *p = &data[100];\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void sizeof1()
{
check("static void f()\n"
"{\n"
" char data[10];\n"
" data[ sizeof(*data) ] = 0;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void sizeof2()
{
check("static void f()\n"
"{\n"
" char data[10];\n"
" data[ sizeof(data[0]) ] = 0;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("static void f()\n"
"{\n"
" int data[2];\n"
" data[ sizeof(data[0]) ] = 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Array 'data[2]' index 4 out of bounds\n", errout.str());
}
void sizeof3()
{
check("struct group { int gr_gid; };\n"
"void f()\n"
"{\n"
" char group[32];\n"
" snprintf(group, sizeof(group), \"%u\", 0);\n"
" struct group *gr;\n"
" snprintf(group, sizeof(group), \"%u\", gr->gr_gid);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void arrayInfo()
{
// Tokenize..
Tokenizer tokenizer;
std::istringstream istr("XY(1) const int a[2] = { 1, 2 };");
tokenizer.tokenize(istr, "test.cpp");
// Clear the error buffer..
errout.str("");
tokenizer.simplifySizeof();
CheckBufferOverrun::ArrayInfo ai;
ASSERT_EQUALS(false, ai.declare(tokenizer.tokens()->tokAt(5), tokenizer));
}
void array_index_1()
{
check("void f()\n"
"{\n"
" char str[0x10];\n"
" str[15] = 0;\n"
" str[16] = 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (error) Array 'str[16]' index 16 out of bounds\n", errout.str());
check("char f()\n"
"{\n"
" char str[16];\n"
" return str[16];\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Array 'str[16]' index 16 out of bounds\n", errout.str());
}
void array_index_2()
{
check("void f()\n"
"{\n"
" char *str = new char[0x10];\n"
" str[15] = 0;\n"
" str[16] = 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (error) Array 'str[16]' index 16 out of bounds\n", errout.str());
}
void array_index_3()
{
{
check("void f()\n"
"{\n"
" int val[50];\n"
" int i, sum=0;\n"
" for (i = 0; i < 100; i++)\n"
" sum += val[i];\n"
"}\n");
ASSERT_EQUALS("[test.cpp:6]: (error) Buffer access out-of-bounds: val\n", errout.str());
}
{
check("void f()\n"
"{\n"
" int val[50];\n"
" int i, sum=0;\n"
" for (i = 1; i < 100; i++)\n"
" sum += val[i];\n"
"}\n");
ASSERT_EQUALS("[test.cpp:6]: (error) Buffer access out-of-bounds: val\n", errout.str());
}
{
check("void f(int a)\n"
"{\n"
" int val[50];\n"
" int i, sum=0;\n"
" for (i = a; i < 100; i++)\n"
" sum += val[i];\n"
"}\n");
ASSERT_EQUALS("[test.cpp:6]: (error) Buffer access out-of-bounds: val\n", errout.str());
}
{
check("typedef struct g g2[3];\n"
"void foo(char *a)\n"
"{\n"
" for (int i = 0; i < 4; i++)\n"
" {\n"
" a[i]=0;\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
{
check("void foo(int argc)\n"
"{\n"
" char a[2];\n"
" for (int i = 4; i < argc; i++)\n"
" {\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
}
void array_index_4()
{
check("const int SIZE = 10;\n"
"void f()\n"
"{\n"
" int i[SIZE];\n"
" i[SIZE] = 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (error) Array 'i[10]' index 10 out of bounds\n", errout.str());
}
void array_index_5()
{
check("void f()\n"
"{\n"
" int i[10];\n"
" i[ sizeof(i) - 1 ] = 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Array 'i[10]' index 39 out of bounds\n", errout.str());
}
void array_index_6()
{
check("struct ABC\n"
"{\n"
" char str[10];\n"
"};\n"
"\n"
"static void f()\n"
"{\n"
" struct ABC abc;\n"
" abc.str[10] = 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:9]: (error) Array 'str[10]' index 10 out of bounds\n", errout.str());
// This is not out of bounds
check("struct ABC\n"
"{\n"
" char str[1];\n"
"};\n"
"\n"
"static void f()\n"
"{\n"
" struct ABC* x = (struct ABC *)malloc(sizeof(struct ABC) + 10);\n"
" x->str[1] = 0;"
"}\n");
ASSERT_EQUALS("", errout.str());
check("struct foo\n"
"{\n"
" char str[10];\n"
"};\n"
"\n"
"void x()\n"
"{\n"
" foo f;\n"
" for ( unsigned int i = 0; i < 64; ++i )\n"
" f.str[i] = 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:10]: (error) Buffer access out-of-bounds: f.str\n", errout.str());
}
void array_index_7()
{
check("struct ABC\n"
"{\n"
" char str[10];\n"
"};\n"
"\n"
"static void f(struct ABC *abc)\n"
"{\n"
" abc->str[10] = 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:8]: (error) Array 'str[10]' index 10 out of bounds\n", errout.str());
}
void array_index_8()
{
check("const int SIZE = 10;\n"
"\n"
"struct ABC\n"
"{\n"
" char str[SIZE];\n"
"};\n"
"\n"
"static void f()\n"
"{\n"
" struct ABC abc;\n"
" abc.str[SIZE] = 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:11]: (error) Array 'str[10]' index 10 out of bounds\n", errout.str());
}
void array_index_9()
{
check("static void memclr( char *data )\n"
"{\n"
" data[10] = 0;\n"
"}\n"
"\n"
"static void f()\n"
"{\n"
" char str[5];\n"
" memclr( str ); // ERROR\n"
"}\n");
TODO_ASSERT_EQUALS("[test.cpp:9] -> [test.cpp:3]: (error) Array index out of bounds\n", errout.str());
ASSERT_EQUALS("", errout.str());
check("static void memclr( int i, char *data )\n"
"{\n"
" data[10] = 0;\n"
"}\n"
"\n"
"static void f()\n"
"{\n"
" char str[5];\n"
" memclr( 0, str ); // ERROR\n"
"}\n");
TODO_ASSERT_EQUALS("[test.cpp:9] -> [test.cpp:3]: (error) Array index out of bounds\n", errout.str());
ASSERT_EQUALS("", errout.str());
check("static void memclr( int i, char *data )\n"
"{\n"
" data[i] = 0;\n"
"}\n"
"\n"
"static void f()\n"
"{\n"
" char str[5];\n"
" memclr( 10, str ); // ERROR\n"
"}\n");
TODO_ASSERT_EQUALS("[test.cpp:9] -> [test.cpp:3]: (possible error) Array index out of bounds\n", errout.str());
ASSERT_EQUALS("", errout.str()); // current result
// This is not an error
check("static void memclr( char *data, int size )\n"
"{\n"
" if( size > 10 )"
" data[10] = 0;\n"
"}\n"
"\n"
"static void f()\n"
"{\n"
" char str[5];\n"
" memclr( str, 5 ); // ERROR\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void array_index_10()
{
check("struct ABC\n"
"{\n"
" char str[10];\n"
"};\n"
"\n"
"static void memclr( char *data )\n"
"{\n"
" data[10] = 0;\n"
"}\n"
"\n"
"static void f(struct ABC *abc)\n"
"{\n"
" memclr(abc->str);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
TODO_ASSERT_EQUALS("[test.cpp:13] -> [test.cpp:8]: (possible error) Array index out of bounds\n", errout.str());
}
void array_index_11()
{
check("class ABC\n"
"{\n"
"public:\n"
" ABC();\n"
" char *str[10];\n"
" struct ABC *next();"
"};\n"
"\n"
"static void f()\n"
"{\n"
" ABC *abc1;\n"
" for ( ABC *abc = abc1; abc; abc = abc->next() )\n"
" {\n"
" abc->str[10] = 0;\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:13]: (error) Array 'str[10]' index 10 out of bounds\n", errout.str());
}
void array_index_12()
{
check("class Fred\n"
"{\n"
"private:\n"
" char str[10];\n"
"public:\n"
" Fred();\n"
"};\n"
"Fred::Fred()\n"
"{\n"
" str[10] = 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:10]: (error) Array 'str[10]' index 10 out of bounds\n", errout.str());
check("class Fred\n"
"{\n"
"private:\n"
" char str[10];\n"
"public:\n"
" char c();\n"
"};\n"
"char Fred::c()\n"
"{\n"
" return str[10];\n"
"}\n");
ASSERT_EQUALS("[test.cpp:10]: (error) Array 'str[10]' index 10 out of bounds\n", errout.str());
}
void array_index_13()
{
check("void f()\n"
"{\n"
" char buf[10];\n"
" for (int i = 0; i < 100; i++)\n"
" {\n"
" if (i < 10)\n"
" int x = buf[i];\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void array_index_14()
{
check("void f()\n"
"{\n"
" int a[10];\n"
" for (int i = 0; i < 10; i++)\n"
" a[i+10] = i;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (error) Array 'a[10]' index 19 out of bounds\n", errout.str());
}
void array_index_15()
{
check("void f()\n"
"{\n"
" int a[10];\n"
" for (int i = 0; i < 10; i++)\n"
" a[10+i] = i;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (error) Array 'a[10]' index 19 out of bounds\n", errout.str());
}
void array_index_16()
{
check("void f()\n"
"{\n"
" int a[10];\n"
" for (int i = 0; i < 10; i++)\n"
" a[i+1] = i;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (error) Array 'a[10]' index 10 out of bounds\n", errout.str());
}
void array_index_17()
{
check("void f()\n"
"{\n"
" int a[10];\n"
" for (int i = 0; i < 10; i++)\n"
" a[i*2] = i;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (error) Array 'a[10]' index 18 out of bounds\n", errout.str());
check("void f()\n"
"{\n"
" int a[12];\n"
" for (int i = 0; i < 12; i+=6)\n"
" a[i+5] = i;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
" int a[12];\n"
" for (int i = 0; i < 12; i+=6)\n"
" a[i+6] = i;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (error) Array 'a[12]' index 12 out of bounds\n", errout.str());
}
void array_index_18()
{
check("void f()\n"
"{\n"
" int a[5];\n"
" for (int i = 0; i < 6; i++)\n"
" {\n"
" a[i] = i;\n"
" i+=1;\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
" int a[5];\n"
" for (int i = 0; i < 6; i++)\n"
" {\n"
" a[i] = i;\n"
" i++;\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
" int a[5];\n"
" for (int i = 0; i < 6; i++)\n"
" {\n"
" a[i] = i;\n"
" ++i;\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
" int a[5];\n"
" for (int i = 0; i < 6; i++)\n"
" {\n"
" a[i] = i;\n"
" i=4;\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
" int a[6];\n"
" for (int i = 0; i < 7; i++)\n"
" {\n"
" a[i] = i;\n"
" i+=1;\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str()); // Catch changes
TODO_ASSERT_EQUALS("[test.cpp:6]: (error) Buffer overrun\n", errout.str());
}
void array_index_19()
{
// "One Past the End" is legal, as long as pointer is not dereferenced.
check("void f()\n"
"{\n"
" char a[2];\n"
" char *end = &(a[2]);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
// Getting more than one past the end is not legal
check("void f()\n"
"{\n"
" char a[2];\n"
" char *end = &(a[3]);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Array 'a[2]' index 3 out of bounds\n", errout.str());
}
void array_index_20()
{
check("void f()\n"
"{\n"
" char a[8];\n"
" int b[10];\n"
" for ( int i = 0; i < 9; i++ )\n"
" b[i] = 0;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void array_index_21()
{
check("class A {\n"
" int indices[2];\n"
" void foo(int indices[3]);\n"
"};\n"
"\n"
"void A::foo(int indices[3]) {\n"
" for(int j=0; j<3; ++j) {\n"
" int b = indices[j];\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void array_index_22()
{
check("#include <cstring>\n"
"int main() {\n"
" size_t indices[2];\n"
" int b = indices[2];\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Array 'indices[2]' index 2 out of bounds\n", errout.str());
}
void array_index_23()
{
check("void foo()\n"
"{\n"
" char c[10];\n"
" c[1<<23]='a';\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Array 'c[10]' index 8388608 out of bounds\n", errout.str());
}
void array_index_24()
{
// ticket #1492 and #1539
if (CHAR_MAX == SCHAR_MAX) // plain char is signed
{
check("void f(char n) {\n"
" int a[n];\n" // n <= CHAR_MAX
" a[-1] = 0;\n" // negative index
" a[128] = 0;\n" // 128 > CHAR_MAX
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Array 'a[128]' index 128 out of bounds\n"
"[test.cpp:3]: (error) Array index -1 is out of bounds\n", errout.str());
}
else // plain char is unsigned
{
check("void f(char n) {\n"
" int a[n];\n" // n <= CHAR_MAX
" a[-1] = 0;\n" // negative index
" a[256] = 0;\n" // 256 > CHAR_MAX
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (error) Array 'a[256]' index -1 out of bounds\n"
"[test.cpp:4]: (error) Array 'a[256]' index 256 out of bounds\n", errout.str());
}
check("void f(signed char n) {\n"
" int a[n];\n" // n <= SCHAR_MAX
" a[-1] = 0;\n" // negative index
" a[128] = 0;\n" // 128 > SCHAR_MAX
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Array 'a[128]' index 128 out of bounds\n"
"[test.cpp:3]: (error) Array index -1 is out of bounds\n", errout.str());
check("void f(unsigned char n) {\n"
" int a[n];\n" // n <= UCHAR_MAX
" a[-1] = 0;\n" // negative index
" a[256] = 0;\n" // 256 > UCHAR_MAX
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Array 'a[256]' index 256 out of bounds\n"
"[test.cpp:3]: (error) Array index -1 is out of bounds\n", errout.str());
check("void f(short n) {\n"
" int a[n];\n" // n <= SHRT_MAX
" a[-1] = 0;\n" // negative index
" a[32768] = 0;\n" // 32768 > SHRT_MAX
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Array 'a[32768]' index 32768 out of bounds\n"
"[test.cpp:3]: (error) Array index -1 is out of bounds\n", errout.str());
check("void f(unsigned short n) {\n"
" int a[n];\n" // n <= USHRT_MAX
" a[-1] = 0;\n" // negative index
" a[65536] = 0;\n" // 65536 > USHRT_MAX
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Array 'a[65536]' index 65536 out of bounds\n"
"[test.cpp:3]: (error) Array index -1 is out of bounds\n", errout.str());
check("void f(signed short n) {\n"
" int a[n];\n" // n <= SHRT_MAX
" a[-1] = 0;\n" // negative index
" a[32768] = 0;\n" // 32768 > SHRT_MAX
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Array 'a[32768]' index 32768 out of bounds\n"
"[test.cpp:3]: (error) Array index -1 is out of bounds\n", errout.str());
if (sizeof(int) == 4)
{
check("void f(int n) {\n"
" int a[n];\n" // n <= INT_MAX
" a[-1] = 0;\n" // negative index
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (error) Array index -1 is out of bounds\n", errout.str());
check("void f(unsigned int n) {\n"
" int a[n];\n" // n <= UINT_MAX
" a[-1] = 0;\n" // negative index
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (error) Array index -1 is out of bounds\n", errout.str());
check("void f(signed int n) {\n"
" int a[n];\n" // n <= INT_MAX
" a[-1] = 0;\n" // negative index
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (error) Array index -1 is out of bounds\n", errout.str());
}
}
void array_index_25()
{
// ticket #1536
check("void foo()\n"
"{\n"
" long l[SOME_SIZE];\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void array_index_26()
{
check("void f()\n"
"{\n"
" int a[3];\n"
" for (int i = 3; 0 <= i; i--)\n"
" a[i] = i;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (error) Buffer access out-of-bounds: a\n", errout.str());
check("void f()\n"
"{\n"
" int a[4];\n"
" for (int i = 3; 0 <= i; i--)\n"
" a[i] = i;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void array_index_27()
{
check("void f()\n"
"{\n"
" int a[10];\n"
" for (int i = 0; i < 10; i++)\n"
" a[i-1] = a[i];\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (error) Array 'a[10]' index -1 out of bounds\n", errout.str());
}
void array_index_28()
{
// ticket #1418
check("void f()\n"
"{\n"
" int i[2];\n"
" int *ip = &i[1];\n"
" ip[-10] = 1;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
TODO_ASSERT_EQUALS("[test.cpp:5]: (error) Array ip[-10] out of bounds\n", errout.str());
}
void array_index_29()
{
// ticket #1724
check("void f()\n"
"{\n"
" int iBuf[10];"
" int *i = &iBuf[9];"
" int *ii = &i[-5];"
" ii[10] = 0;"
"}\n");
ASSERT_EQUALS("", errout.str());
TODO_ASSERT_EQUALS("[test.cpp:6]: (error) Array ii[10] out of bounds\n", errout.str());
}
void array_index_multidim()
{
check("void f()\n"
"{\n"
" char a[2][2];\n"
" a[1][1] = 'a';\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
" char a[2][2][2];\n"
" a[1][1][1] = 'a';\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
" char a[2][2];\n"
" a[2][1] = 'a';\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Array 'a[2][2]' index a[2][1] out of bounds\n", errout.str());
check("void f()\n"
"{\n"
" char a[2][2];\n"
" a[1][2] = 'a';\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Array 'a[2][2]' index a[1][2] out of bounds\n", errout.str());
check("void f()\n"
"{\n"
" char a[2][2][2];\n"
" a[2][1][1] = 'a';\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Array 'a[2][2][2]' index a[2][1][1] out of bounds\n", errout.str());
check("void f()\n"
"{\n"
" char a[2][2][2];\n"
" a[1][2][1] = 'a';\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Array 'a[2][2][2]' index a[1][2][1] out of bounds\n", errout.str());
check("void f()\n"
"{\n"
" char a[2][2][2][2];\n"
" a[1][2][1][1] = 'a';\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Array 'a[2][2][2][2]' index a[1][2][1][1] out of bounds\n", errout.str());
check("void f()\n"
"{\n"
" char a[2][2][2];\n"
" a[1][1][2] = 'a';\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Array 'a[2][2][2]' index a[1][1][2] out of bounds\n", errout.str());
check("void f()\n"
"{\n"
" char a[10][10][10];\n"
" a[2*3][4*3][2] = 'a';\n"
"}\n");
TODO_ASSERT_EQUALS("[test.cpp:4]: (error) Array 'a[10][10][10]' index a[6][12][2] out of bounds\n", errout.str());
check("void f()\n"
"{\n"
" int i=2;\n"
" int ii=10;\n"
" char a[ii][ii][ii];\n"
" a[i*3][4*ii][ii] = 'a';\n"
"}\n");
ASSERT_EQUALS("[test.cpp:6]: (error) Array 'a[10][10][10]' index a[6][40][10] out of bounds\n", errout.str());
check("void f()\n"
"{\n"
" int i=2;\n"
" int ii=1;\n"
" char a[ii][ii][ii];\n"
" a[i][i][i] = 'a';\n"
"}\n");
ASSERT_EQUALS("[test.cpp:6]: (error) Array 'a[1][1][1]' index a[2][2][2] out of bounds\n", errout.str());
check("void f()\n"
"{\n"
" int i=2;\n"
" int ii=i*3;\n"
" char a[ii][ii][ii];\n"
" a[i*3][i*3][i] = 'a';\n"
"}\n");
ASSERT_EQUALS("[test.cpp:6]: (error) Array 'a[6][6][6]' index a[6][6][2] out of bounds\n", errout.str());
}
void array_index_switch_in_for()
{
check("void f()\n"
"{\n"
" int ar[10];\n"
" for (int i = 0; i < 10; ++i)\n"
" {\n"
" switch(i)\n"
" {\n"
" case 9:\n"
" ar[i] = 0;\n"
" break;\n"
" default:\n"
" ar[i] = ar[i+1];\n"
" break;\n"
" };\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
" int ar[10];\n"
" for (int i = 0; i < 10; ++i)\n"
" {\n"
" switch(i)\n"
" {\n"
" case 8:\n"
" ar[i] = 0;\n"
" break;\n"
" default:\n"
" ar[i] = ar[i+1];\n"
" break;\n"
" };\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
TODO_ASSERT_EQUALS("[test.cpp:12]: (error) Array index out of bounds\n", errout.str());
}
void array_index_calculation()
{
// #1193 - false negative: array out of bounds in loop when there is calculation
check("void f()\n"
"{\n"
" char data[8];\n"
" for (int i = 19; i < 36; ++i) {\n"
" data[(i-0)/2] = 0;\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
TODO_ASSERT_EQUALS("[test.cpp:5]: (error) Array index out of bounds\n", errout.str());
}
void array_index_negative()
{
// #948 - array index out of bound not detected 'a[-1] = 0'
check("void f()\n"
"{\n"
" char data[8];\n"
" data[-1] = 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Array index -1 is out of bounds\n", errout.str());
check("void f()\n"
"{\n"
" char data[8][4];\n"
" data[5][-1] = 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Array index -1 is out of bounds\n", errout.str());
// #1614 - negative index is ok for pointers
check("void foo(char *p)\n"
"{\n"
" p[-1] = 0;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" char s[] = \"abc\";\n"
" char *p = s + strlen(s);\n"
" if (p[-1]);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void array_index_for_decr()
{
check("void f()\n"
"{\n"
" char data[8];\n"
" for (int i = 10; i > 0; --i) {\n"
" data[i] = 0;\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (error) Buffer access out-of-bounds: data\n", errout.str());
check("void f()\n"
"{\n"
" char val[5];\n"
" for (unsigned int i = 3; i < 5; --i) {\n"
" val[i+1] = val[i];\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
" char val[5];\n"
" for (int i = 3; i < 5; --i) {\n"
" val[i+1] = val[i];\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str()); // catch changes
TODO_ASSERT_EQUALS("[test.cpp:5]: (error) Array 'val[5]' index -1 out of bounds\n", errout.str());
}
void array_index_varnames()
{
check("struct A {\n"
" char data[4];\n"
" struct B { char data[3]; };\n"
" B b;\n"
"};\n"
"\n"
"void f()\n"
"{\n"
" A a;\n"
" a.data[3] = 0;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void buffer_overrun_1()
{
check("void f()\n"
"{\n"
" char str[3];\n"
" strcpy(str, \"abc\");\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Buffer access out-of-bounds: str\n", errout.str());
check("void f(int fd)\n"
"{\n"
" char str[3];\n"
" read(fd, str, 3);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f(int fd)\n"
"{\n"
" char str[3];\n"
" read(fd, str, 4);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Buffer access out-of-bounds: str\n", errout.str());
check("void f(int fd)\n"
"{\n"
" char str[3];\n"
" write(fd, str, 3);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f(int fd)\n"
"{\n"
" char str[3];\n"
" write(fd, str, 4);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Buffer access out-of-bounds: str\n", errout.str());
check("void f()\n"
"{\n"
" long bb[2];\n"
" write(stdin, bb, sizeof(bb));\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
" char str[3];\n"
" fgets(str, 3, stdin);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
" char str[3];\n"
" fgets(str, 4, stdin);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Buffer access out-of-bounds: str\n", errout.str());
// fread
check("void f(FILE* fd)\n"
"{\n"
"char str[3];\n"
"fread(str,sizeof(char),4,fd);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Buffer access out-of-bounds: str\n", errout.str());
// fread
check("void f(FILE* fd)\n"
"{\n"
"unsigned int i = 3;\n"
"char str[i];\n"
"fread(str,sizeof(char),i+1,fd);\n"
"}\n");
ASSERT_EQUALS("", errout.str()); // catch changes
TODO_ASSERT_EQUALS("[test.cpp:5]: (error) Buffer access out-of-bounds\n", errout.str());
check("void f(FILE* fd)\n"
"{\n"
"char str[3*sizeof(char)];\n"
"fread(str,sizeof(char),3,fd);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
// fwrite
check("void f(FILE* fd)\n"
"{\n"
"char str[3];\n"
"fwrite(str,sizeof(char),4,fd);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Buffer access out-of-bounds: str\n", errout.str());
check("void f(FILE* fd)\n"
"{\n"
"unsigned int i = 3;\n"
"char str[i];\n"
"fwrite(str,sizeof(char),i+1,fd);\n"
"}\n");
ASSERT_EQUALS("", errout.str()); // catch changes
TODO_ASSERT_EQUALS("[test.cpp:5]: (error) Buffer access out-of-bounds\n", errout.str());
check("void f(FILE* fd)\n"
"{\n"
"char str[3*sizeof(char)];\n"
"fwrite(str,sizeof(char),3,fd);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void buffer_overrun_2()
{
check("struct ABC\n"
"{\n"
" char str[5];\n"
"};\n"
"\n"
"static void f(struct ABC *abc)\n"
"{\n"
" strcpy( abc->str, \"abcdef\" );\n"
"}\n");
ASSERT_EQUALS("[test.cpp:8]: (error) Buffer access out-of-bounds: abc.str\n", errout.str());
}
void buffer_overrun_3()
{
check("int a[10];\n"
"\n"
"void foo()\n"
"{\n"
" int i;\n"
" for (i = 0; i <= 10; ++i)\n"
" a[i] = 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:7]: (error) Buffer access out-of-bounds: a\n", errout.str());
}
void buffer_overrun_4()
{
check("void foo()\n"
"{\n"
" const char *p[2];\n"
" for (int i = 0; i < 8; ++i)\n"
" p[i] = 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (error) Buffer access out-of-bounds: p\n", errout.str());
// No false positive
check("void foo(int x, int y)\n"
"{\n"
" const char *p[2];\n"
" const char *s = y + p[1];\n"
" p[1] = 0;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
// There is no error here
check("void f1(char *s,int size)\n"
"{\n"
" if( size > 10 ) strcpy(s,\"abc\");\n"
"}\n"
"void f2()\n"
"{\n"
" char s[3];\n"
" f1(s,3);\n"
"}\n");
//ASSERT_EQUALS("[test.cpp:3]: (possible error) Buffer access out-of-bounds\n", errout.str());
ASSERT_EQUALS("", errout.str());
check("void f1(char *s,int size)\n"
"{\n"
" if( size > 10 ) strcpy(s,\"abc\");\n"
"}\n"
"void f2()\n"
"{\n"
" char s[3];\n"
" f1(s,3);\n"
"}\n", false);
ASSERT_EQUALS("", errout.str());
}
void buffer_overrun_5()
{
check("void f()\n"
"{\n"
" char n[5];\n"
" sprintf(n, \"d\");\n"
" printf(\"hello!\");\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void buffer_overrun_6()
{
check("void f()\n"
"{\n"
" char n[5];\n"
" strcat(n, \"abc\");\n"
" strcat(n, \"def\");\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (error) Buffer access out-of-bounds: n\n", errout.str());
check("void f()\n"
"{\n"
" char n[5];\n"
" strcat(strcat(n, \"abc\"), \"def\");\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Buffer access out-of-bounds: n\n", errout.str());
}
void buffer_overrun_7()
{
// ticket #731
check("void f()\n"
"{\n"
" char a[2];\n"
" strcpy(a, \"a\\0\");\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void buffer_overrun_8()
{
// ticket #714
check("void f()\n"
"{\n"
" char a[5];\n"
" for (int i = 0; i < 20; i+= 100)\n"
" {\n"
" a[i] = 0;\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
" char a[5];\n"
" for (int i = 0; i < 20; i = i + 100)\n"
" {\n"
" a[i] = 0;\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
" char a[5];\n"
" for (int i = 0; i < 20; i = 100 + i)\n"
" {\n"
" a[i] = 0;\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void buffer_overrun_9()
{
// ticket #738
check("void f()\n"
"{\n"
" char a[5];\n"
" for (int i = 0; i < 20; )\n"
" {\n"
" a[i] = 0;\n"
" i += 100;\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void buffer_overrun_10()
{
// ticket #740
check("void f()\n"
"{\n"
" char a[4];\n"
" for (int i = 0; i < 4; i++)\n"
" {\n"
" char b = a[i];\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void buffer_overrun_11()
{
check("void f()\n"
"{\n"
" char a[4];\n"
" for (float i=0; i<10.0;i+=0.1)\n"
" {\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
" char a[4];\n"
" for (float i=0; i<10.0;i=i+0.1)\n"
" {\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
" char a[4];\n"
" for (float i=0; i<10.0;i=0.1+i)\n"
" {\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void buffer_overrun_12()
{
// ticket #900
check("void f() {\n"
" char *a = new char(30);\n"
" sprintf(a, \"%s\", \"b\");\n"
" delete a;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (error) Buffer access out-of-bounds\n", errout.str());
}
void buffer_overrun_13()
{
// ticket #836
check("void f() {\n"
" char a[10];\n"
" memset(a+5, 0, 10);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (error) Buffer access out-of-bounds: a\n", errout.str());
check("void f() {\n"
" char a[10];\n"
" memmove(a, a+5, 10);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (error) Buffer access out-of-bounds: a\n", errout.str());
}
void buffer_overrun_14()
{
check("void f(char *a) {\n"
" char *b = new char[strlen(a)];\n"
" strcpy(b, a);\n"
" return b;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (error) Buffer access out-of-bounds\n", errout.str());
check("void f(char *a) {\n"
" char *b = new char[strlen(a) + 1];\n"
" strcpy(b, a);\n"
" return b;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f(char *a) {\n"
" char *b = new char[strlen(a)];\n"
" a[0] = '\\0';\n"
" strcpy(b, a);\n"
" return b;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f(char *a) {\n"
" char *b = malloc(strlen(a));\n"
" b = realloc(b, 10000);\n"
" strcpy(b, a);\n"
" return b;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f(char *a) {\n"
" char *b = malloc(strlen(a));\n"
" strcpy(b, a);\n"
" return b;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (error) Buffer access out-of-bounds\n", errout.str());
check("void f(char *a) {\n"
" char *b = malloc(strlen(a));\n"
" if (1) {\n"
" strcpy(b, a);\n"
" }\n"
" return b;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Buffer access out-of-bounds\n", errout.str());
check("void f(char *a) {\n"
" char *b = malloc(strlen(a) + 1);\n"
" strcpy(b, a);\n"
" return b;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f(char *a, char *c) {\n"
" char *b = realloc(c, strlen(a));\n"
" strcpy(b, a);\n"
" return b;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (error) Buffer access out-of-bounds\n", errout.str());
check("void f(char *a, char *c) {\n"
" char *b = realloc(c, strlen(a) + 1);\n"
" strcpy(b, a);\n"
" return b;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f(char *a) {\n"
" char *b = malloc(strlen(a));\n"
" sprintf(b, \"%s\", a);\n"
" return b;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (error) Buffer access out-of-bounds\n", errout.str());
}
void buffer_overrun_15() // ticket #1787
{
check("class A : public B {\n"
" char val[12];\n"
" void f(int i, int ii);\n"
"};\n"
"void A::f(int i, int ii)\n"
"{\n"
" sprintf(val, \"drive_%d_partition_%d_size\", i, ii) ;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:7]: (error) Buffer access out-of-bounds\n", errout.str());
}
void sprintf1()
{
check("void f()\n"
"{\n"
" char str[3];\n"
" sprintf(str, \"%s\", \"abc\");\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Buffer access out-of-bounds\n", errout.str());
check("void f()\n"
"{\n"
" char * c = new char[10];\n"
" sprintf(c, \"%s\", \"/usr/LongLongLongLongUserName/bin/LongLongApplicationName\");\n"
" delete [] c;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Buffer access out-of-bounds\n", errout.str());
}
void sprintf2()
{
check("int getnumber();\n"
"void f()\n"
"{\n"
" char str[5];\n"
" sprintf(str, \"%d: %s\", getnumber(), \"abcde\");\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (error) Buffer access out-of-bounds\n", errout.str());
}
void sprintf3()
{
check("void f()\n"
"{\n"
" char str[3];\n"
" sprintf(str, \"test\");\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Buffer access out-of-bounds\n", errout.str());
check("void f()\n"
"{\n"
" char str[5];\n"
" sprintf(str, \"test%s\", \"\");\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void sprintf4()
{
// ticket #690
check("void f()\n"
"{\n"
" char a[3];\n"
" sprintf(a, \"%02ld\", 99);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void sprintf5()
{
// ticket #729
check("void f(int condition)\n"
"{\n"
" char buf[3];\n"
" sprintf(buf, \"%s\", condition ? \"11\" : \"22\");\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void sprintf6()
{
check("void f(int condition)\n"
"{\n"
" char buf[3];\n"
" sprintf(buf, \"%s\", condition ? \"11\" : \"222\");\n"
"}\n");
ASSERT_EQUALS("", errout.str()); // catch changes
TODO_ASSERT_EQUALS("[test.cpp:4]: (error) Buffer access out-of-bounds\n", errout.str());
}
void sprintf7()
{
check("struct Foo { char a[1]; };\n"
"void f()\n"
"{\n"
" struct Foo x;\n"
" sprintf(x.a, \"aa\");\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (error) Buffer access out-of-bounds\n", errout.str());
}
void sprintf8()
{
check("struct Foo { char a[3]; };\n"
"void f()\n"
"{\n"
" struct Foo x;\n"
" sprintf(x.a, \"aa\");\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void snprintf1()
{
check("void f()\n"
"{\n"
" char str[5];\n"
" snprintf(str, 10, \"%s\", \"abc\");\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) snprintf size is out of bounds\n", errout.str());
}
void snprintf2()
{
check("void f()\n"
"{\n"
" char str[5];\n"
" snprintf(str, 5, \"%s\", \"abc\");\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void snprintf3()
{
check("void f()\n"
"{\n"
" char str[5];\n"
" snprintf(str, sizeof str, \"%s\", \"abc\");\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void snprintf4()
{
check("void f(int x)\n"
"{\n"
" char str[5];\n"
" snprintf(str, 8 - x, \"abcdefghijkl\");\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void snprintf5()
{
check("struct Foo { char a[1]; };\n"
"void f()\n"
"{\n"
" struct Foo x;\n"
" snprintf(x.a, 2, \"aa\");\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (error) snprintf size is out of bounds\n", errout.str());
}
void snprintf6()
{
check("struct Foo { char a[3]; };\n"
"void f()\n"
"{\n"
" struct Foo x;\n"
" snprintf(x.a, 2, \"aa\");\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void strncat1()
{
check("void f(char *a, char *b)\n"
"{\n"
" char str[16];\n"
" strncpy(str, a, 10);\n"
" strncat(str, b, 10);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (style) Dangerous usage of strncat. Tip: the 3rd parameter means maximum number of characters to append\n", errout.str());
}
void strncat2()
{
check("void f(char *a)\n"
"{\n"
" char str[5];\n"
" strncat(str, a, 5);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (style) Dangerous usage of strncat. Tip: the 3rd parameter means maximum number of characters to append\n", errout.str());
}
void strncat3()
{
check("struct Foo { char a[4]; };\n"
"void f(char *a)\n"
"{\n"
" struct Foo x;\n"
" strncat(x.a, a, 5);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (error) Buffer access out-of-bounds: x.a\n", errout.str());
}
void strcat1()
{
check("struct Foo { char a[4]; };\n"
"void f()\n"
"{\n"
" struct Foo x;\n"
" strcat(x.a, \"aa\");\n"
" strcat(x.a, \"aa\");\n"
"}\n");
ASSERT_EQUALS("[test.cpp:6]: (error) Buffer access out-of-bounds\n", errout.str());
}
void strcat2()
{
check("struct Foo { char a[5]; };\n"
"void f()\n"
"{\n"
" struct Foo x;\n"
" strcat(x.a, \"aa\");\n"
" strcat(x.a, \"aa\");\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
// memchr/memset/memcpy/etc
void memfunc()
{
check("struct S {\n"
" char a[5];\n"
"};\n"
"void f()\n"
"{\n"
" S s;\n"
" memset(s.a, 0, 10);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:7]: (error) Buffer access out-of-bounds: s.a\n", errout.str());
check("void f()\n"
"{\n"
" char str[5];\n"
" memset(str, 0, 10);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Buffer access out-of-bounds: str\n", errout.str());
check("void f()\n"
"{\n"
" char a[5], b[50];\n"
" memcpy(a, b, 10);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Buffer access out-of-bounds: a\n", errout.str());
check("void f()\n"
"{\n"
" char a[5], b[50];\n"
" memmove(a, b, 10);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Buffer access out-of-bounds: a\n", errout.str());
// When this TODO assertion works, ticket #909 can probably be closed
check("void f()\n"
"{\n"
" char a[5], b[50];\n"
" memchr(a, b, 10);\n"
"}\n");
TODO_ASSERT_EQUALS("[test.cpp:4]: (error) Buffer access out-of-bounds\n", errout.str());
ASSERT_EQUALS("", errout.str());
}
void varid1()
{
check("void foo()\n"
"{\n"
" char str[10];\n"
" if (str[0])\n"
" {\n"
" char str[50];\n"
" str[30] = 0;\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void varid2()
{
check("void foo()\n"
"{\n"
" char str[10];\n"
" if (str[0])\n"
" {\n"
" char str[50];\n"
" memset(str,0,50);\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void assign1()
{
check("char str[3] = {'a', 'b', 'c'};\n"
"\n"
"void foo()\n"
"{\n"
" str[3] = 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (error) Array 'str[3]' index 3 out of bounds\n", errout.str());
}
void alloc1()
{
check("void foo()\n"
"{\n"
" char *s = new char[10];\n"
" s[10] = 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Array 's[10]' index 10 out of bounds\n", errout.str());
check("void foo()\n"
"{\n"
"char * buf = new char[8];\n"
"buf[7] = 0;\n"
"delete [] buf;\n"
"buf = new char[9];\n"
"buf[8] = 0;\n"
"delete [] buf;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
"char * buf = new char[8];\n"
"buf[7] = 0;\n"
"delete [] buf;\n"
"buf = new char[9];\n"
"buf[9] = 0;\n"
"delete [] buf;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:7]: (error) Array 'buf[9]' index 9 out of bounds\n", errout.str());
check("void f() {\n"
" int *tab4 = malloc(20 * sizeof(int));\n"
" tab4[19] = 0;\n"
" free(tab4);\n"
" tab4 = malloc(21 * sizeof(int));\n"
" tab4[20] = 0;\n"
" free(tab4);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" int *tab4 = malloc(20 * sizeof(int));\n"
" tab4[19] = 0;\n"
" tab4 = realloc(tab4,21 * sizeof(int));\n"
" tab4[20] = 0;\n"
" free(tab4);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
// data is allocated with malloc
void alloc2()
{
check("void foo()\n"
"{\n"
" char *s = (char *)malloc(10);\n"
" s[10] = 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Array 's[10]' index 10 out of bounds\n", errout.str());
// ticket #842
check("void f() {\n"
" int *tab4 = malloc(20 * sizeof(int));\n"
" tab4[20] = 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (error) Array 'tab4[20]' index 20 out of bounds\n", errout.str());
// ticket #1134
check("void f() {\n"
" int *x, i;\n"
" x = malloc(10 * sizeof(int));\n"
" x[10] = 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Array 'x[10]' index 10 out of bounds\n", errout.str());
}
void memset1()
{
check("void foo()\n"
"{\n"
" char s[10];\n"
" memset(s, 5, '*');\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (style) The size argument is given as a char constant\n", errout.str());
check("void foo()\n"
"{\n"
" int* x[5];\n"
" memset(x, 0, sizeof(x));\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void memset2()
{
check("class X {\n"
" char* array[2];\n"
" X();\n"
"};\n"
"X::X() {\n"
" memset(array, 0, sizeof(array));\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void counter_test()
{
std::list<const Token*> unknownParameter;
unknownParameter.push_back(0);
ASSERT_EQUALS(6, CheckBufferOverrun::countSprintfLength("Hello", unknownParameter));
ASSERT_EQUALS(2, CheckBufferOverrun::countSprintfLength("s", unknownParameter));
ASSERT_EQUALS(2, CheckBufferOverrun::countSprintfLength("i", unknownParameter));
ASSERT_EQUALS(2, CheckBufferOverrun::countSprintfLength("%d", unknownParameter));
ASSERT_EQUALS(2, CheckBufferOverrun::countSprintfLength("%1d", unknownParameter));
ASSERT_EQUALS(3, CheckBufferOverrun::countSprintfLength("%2.2d", unknownParameter));
ASSERT_EQUALS(1, CheckBufferOverrun::countSprintfLength("%s", unknownParameter));
ASSERT_EQUALS(2, CheckBufferOverrun::countSprintfLength("f%s", unknownParameter));
ASSERT_EQUALS(1, CheckBufferOverrun::countSprintfLength("%-s", unknownParameter));
ASSERT_EQUALS(6, CheckBufferOverrun::countSprintfLength("%-5s", unknownParameter));
ASSERT_EQUALS(2, CheckBufferOverrun::countSprintfLength("\\\"", unknownParameter));
ASSERT_EQUALS(7, CheckBufferOverrun::countSprintfLength("Hello \\0Text", unknownParameter));
ASSERT_EQUALS(1, CheckBufferOverrun::countSprintfLength("\\0", unknownParameter));
ASSERT_EQUALS(2, CheckBufferOverrun::countSprintfLength("%%", unknownParameter));
ASSERT_EQUALS(3, CheckBufferOverrun::countSprintfLength("%d%d", unknownParameter));
ASSERT_EQUALS(3, CheckBufferOverrun::countSprintfLength("\\\\a%s\\0a", unknownParameter));
ASSERT_EQUALS(10, CheckBufferOverrun::countSprintfLength("\\\\\\\\Hello%d \\0Text\\\\\\\\", unknownParameter));
ASSERT_EQUALS(4, CheckBufferOverrun::countSprintfLength("%%%%%d", unknownParameter));
Token strTok(0);
strTok.str("\"12345\"");
std::list<const Token*> stringAsParameter;
stringAsParameter.push_back(&strTok);
ASSERT_EQUALS(9, CheckBufferOverrun::countSprintfLength("str%s", stringAsParameter));
ASSERT_EQUALS(6, CheckBufferOverrun::countSprintfLength("%-4s", stringAsParameter));
ASSERT_EQUALS(6, CheckBufferOverrun::countSprintfLength("%-5s", stringAsParameter));
ASSERT_EQUALS(7, CheckBufferOverrun::countSprintfLength("%-6s", stringAsParameter));
ASSERT_EQUALS(5, CheckBufferOverrun::countSprintfLength("%.4s", stringAsParameter));
ASSERT_EQUALS(6, CheckBufferOverrun::countSprintfLength("%.5s", stringAsParameter));
ASSERT_EQUALS(6, CheckBufferOverrun::countSprintfLength("%.6s", stringAsParameter));
ASSERT_EQUALS(6, CheckBufferOverrun::countSprintfLength("%5.6s", stringAsParameter));
ASSERT_EQUALS(7, CheckBufferOverrun::countSprintfLength("%6.6s", stringAsParameter));
std::list<const Token*> intAsParameter;
Token numTok(0);
numTok.str("12345");
intAsParameter.push_back(&numTok);
ASSERT_EQUALS(6, CheckBufferOverrun::countSprintfLength("%02ld", intAsParameter));
ASSERT_EQUALS(9, CheckBufferOverrun::countSprintfLength("%08ld", intAsParameter));
ASSERT_EQUALS(6, CheckBufferOverrun::countSprintfLength("%.2d", intAsParameter));
ASSERT_EQUALS(9, CheckBufferOverrun::countSprintfLength("%08.2d", intAsParameter));
TODO_ASSERT_EQUALS(5, CheckBufferOverrun::countSprintfLength("%x", intAsParameter));
ASSERT_EQUALS(5, CheckBufferOverrun::countSprintfLength("%4x", intAsParameter));
ASSERT_EQUALS(6, CheckBufferOverrun::countSprintfLength("%5x", intAsParameter));
ASSERT_EQUALS(5, CheckBufferOverrun::countSprintfLength("%.4x", intAsParameter));
ASSERT_EQUALS(6, CheckBufferOverrun::countSprintfLength("%.5x", intAsParameter));
ASSERT_EQUALS(6, CheckBufferOverrun::countSprintfLength("%1.5x", intAsParameter));
ASSERT_EQUALS(6, CheckBufferOverrun::countSprintfLength("%5.1x", intAsParameter));
std::list<const Token*> floatAsParameter;
Token floatTok(0);
floatTok.str("1.12345f");
floatAsParameter.push_back(&floatTok);
TODO_ASSERT_EQUALS(5, CheckBufferOverrun::countSprintfLength("%.2f", floatAsParameter));
ASSERT_EQUALS(9, CheckBufferOverrun::countSprintfLength("%8.2f", floatAsParameter));
TODO_ASSERT_EQUALS(5, CheckBufferOverrun::countSprintfLength("%2.2f", floatAsParameter));
std::list<const Token*> floatAsParameter2;
Token floatTok2(0);
floatTok2.str("100.12345f");
floatAsParameter2.push_back(&floatTok2);
TODO_ASSERT_EQUALS(7, CheckBufferOverrun::countSprintfLength("%2.2f", floatAsParameter2));
TODO_ASSERT_EQUALS(7, CheckBufferOverrun::countSprintfLength("%.2f", floatAsParameter));
TODO_ASSERT_EQUALS(7, CheckBufferOverrun::countSprintfLength("%4.2f", floatAsParameter));
std::list<const Token*> multipleParams;
multipleParams.push_back(&strTok);
multipleParams.push_back(0);
multipleParams.push_back(&numTok);
ASSERT_EQUALS(15, CheckBufferOverrun::countSprintfLength("str%s%d%d", multipleParams));
ASSERT_EQUALS(26, CheckBufferOverrun::countSprintfLength("str%-6s%08ld%08ld", multipleParams));
}
void strncpy1()
{
check("void f()\n"
"{\n"
" char a[6];\n"
" char c[7];\n"
" strcpy(a, \"hello\");\n"
" strncpy(c, a, sizeof(c));\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
" char a[6];\n"
" char c[6];\n"
" strcpy(a,\"hello\");\n"
" strncpy(c,a,sizeof(c));\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
" char a[6];\n"
" char c[5];\n"
" strcpy(a,\"hello\");\n"
" strncpy(c,a,sizeof(c)+1);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:6]: (error) Buffer access out-of-bounds: c\n", errout.str());
check("void f()\n"
"{\n"
" char c[6];\n"
" strncpy(c,\"hello!\",sizeof(c));\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
" char c[6];\n"
" strncpy(c,\"hello!\",sizeof(c)+1);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Buffer access out-of-bounds: c\n", errout.str());
check("struct AB { char a[10]; };\n"
"void foo(AB *ab)\n"
"{\n"
" strncpy(x, ab->a, 100);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void unknownType()
{
check("void f()\n"
"{\n"
" UnknownType *a = malloc(4);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void terminateStrncpy1()
{
check("void foo ( char *bar )\n"
"{\n"
" char baz[100];\n"
" strncpy(baz, bar, sizeof(baz));\n"
" strncpy(baz, bar, sizeof(baz));\n"
" baz[99] = 0;\n"
" strncpy(baz, bar, sizeof(baz));\n"
" baz[sizeof(baz)-1] = 0;\n"
" strncpy(baz, bar, sizeof(baz));\n"
" *(baz + 99) = 0;\n"
" strncpy(baz, bar, sizeof(baz));\n"
" bar[99] = 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (style) After a strncpy() the buffer should be zero-terminated\n", errout.str());
// Test with invalid code that there is no segfault
check("char baz[100];\n"
"strncpy(baz, \"var\", sizeof(baz))\n");
ASSERT_EQUALS("", errout.str());
// Test that there are no duplicate error messages
check("void foo ( char *bar )\n"
"{\n"
" char baz[100];\n"
" strncpy(baz, bar, sizeof(baz));\n"
" foo(baz);\n"
" foo(baz);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (style) After a strncpy() the buffer should be zero-terminated\n", errout.str());
}
void terminateStrncpy2()
{
check("char *foo ( char *bar )\n"
"{\n"
" char baz[100];\n"
" strncpy(baz, bar, sizeof(baz));\n"
" bar[99] = 0;\n"
" return baz;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (style) After a strncpy() the buffer should be zero-terminated\n", errout.str());
}
void recursive_long_time()
{
// Just test that recursive check doesn't take long time
check("char *f2 ( char *b )\n"
"{\n"
" f2( b );\n"
" f2( b );\n"
" f2( b );\n"
" f2( b );\n"
" f2( b );\n"
" f2( b );\n"
" f2( b );\n"
" f2( b );\n"
" f2( b );\n"
" f2( b );\n"
" f2( b );\n"
" f2( b );\n"
" f2( b );\n"
" f2( b );\n"
" f2( b );\n"
"}\n"
"void f()\n"
"{\n"
" char a[10];\n"
" f2(a);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
// Ticket #1587 - crash
void crash()
{
check("struct struct A\n"
"{\n"
" int alloclen;\n"
"};\n"
"\n"
"void foo()\n"
"{\n"
" struct A *str;\n"
" str = malloc(4);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void epcheck(const char code[])
{
// Tokenize..
Tokenizer tokenizer;
std::istringstream istr(code);
tokenizer.tokenize(istr, "test.cpp");
tokenizer.simplifyTokenList();
// Clear the error buffer..
errout.str("");
// Check for buffer overruns..
Settings settings;
CheckBufferOverrun checkBufferOverrun(&tokenizer, &settings, this);
checkBufferOverrun.executionPaths();
}
void executionPaths1()
{
epcheck("void f(int a)\n"
"{\n"
" int buf[10];\n"
" int i = 5;\n"
" if (a == 1)\n"
" i = 1000;\n"
" buf[i] = 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:7]: (error) Array 'buf[10]' index 1000 out of bounds\n", errout.str());
epcheck("void f(int a)\n"
"{\n"
" int buf[10][5];\n"
" int i = 5;\n"
" if (a == 1)\n"
" i = 1000;\n"
" buf[i][0] = 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:7]: (error) Array 'buf[10][5]' index 1000 out of bounds\n", errout.str());
}
void executionPaths2()
{
epcheck("void foo()\n"
"{\n"
" char a[64];\n"
" int sz = sizeof(a);\n"
" bar(&sz);\n"
" a[sz] = 0;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void cmdLineArgs1()
{
check("int main(int argc, char* argv[])\n"
"{\n"
" char prog[10];\n"
" strcpy(prog, argv[0]);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Buffer overrun possible for long cmd-line args\n", errout.str());
check("int main(int argc, char* argv[])\n"
"{\n"
" char prog[10] = {'\\0'};\n"
" strcat(prog, argv[0]);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Buffer overrun possible for long cmd-line args\n", errout.str());
check("int main(int argc, char* argv[])\n"
"{\n"
" char prog[10];\n"
" sprintf(prog, \"%s\", argv[0]);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Buffer overrun possible for long cmd-line args\n", errout.str());
check("int main(int argc, char **argv, char **envp)\n"
"{\n"
" char prog[10];\n"
" strcpy(prog, argv[0]);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Buffer overrun possible for long cmd-line args\n", errout.str());
check("int main(int argc, char **argv, char **envp)\n"
"{\n"
" char prog[10] = {'\\0'};\n"
" strcat(prog, argv[0]);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Buffer overrun possible for long cmd-line args\n", errout.str());
check("int main(int argc, char **argv, char **envp)\n"
"{\n"
" char prog[10];\n"
" sprintf(prog, \"%s\", argv[0]);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Buffer overrun possible for long cmd-line args\n", errout.str());
check("int main(int argc, char **options)\n"
"{\n"
" char prog[10];\n"
" strcpy(prog, options[0]);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Buffer overrun possible for long cmd-line args\n", errout.str());
check("int main(int argc, char **options)\n"
"{\n"
" char prog[10] = {'\\0'};\n"
" strcat(prog, options[0]);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Buffer overrun possible for long cmd-line args\n", errout.str());
check("int main(int argc, char **options)\n"
"{\n"
" char prog[10];\n"
" sprintf(prog, \"%s\", *options);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Buffer overrun possible for long cmd-line args\n", errout.str());
check("int main(int argc, char **argv, char **envp)\n"
"{\n"
" char prog[10];\n"
" if (strlen(argv[0]) < 10)\n"
" strcpy(prog, argv[0]);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("int main(int argc, char **argv, char **envp)\n"
"{\n"
" char prog[10] = {'\\0'};\n"
" if (10 > strlen(argv[0]))\n"
" strcat(prog, argv[0]);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("int main(int argc, char **argv, char **envp)\n"
"{\n"
" char prog[10];\n"
" sprintf(prog, \"%p\", argv[0]);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("int main(int argc, char **argv, char **envp)\n"
"{\n"
" char prog[10];\n"
" argv[0][0] = '\\0';\n"
" strcpy(prog, argv[0]);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
};
REGISTER_TEST(TestBufferOverrun)
