Wireshark: memory corruption when reading a malformed pcap file (upstream bug #5652)

Wireshark 1.2.0 through 1.2.14, 1.4.0 through 1.4.3, and 1.5.0 frees an uninitialized pointer during processing of a .pcap file in the pcap-ng format, which allows remote attackers to cause a denial of service memory corruption or possibly have unspecified other impact via a malformed file...