--- a/avahi-core/server.c +++ b/avahi-core/server.c @@ -898,6 +898,12 @@ static void dispatch_packet(AvahiServer *s, AvahiDnsPacket *p, const AvahiAddres return; } + if (port <= 0) { + /* This fixes RHBZ #475394 */ + avahi_log_warn("Received packet from invalid source port."); + return; + } + if (avahi_address_is_ipv4_in_ipv6(src_address)) /* This is an IPv4 address encapsulated in IPv6, so let's ignore it. */ return;