In Wireshark 2.2.0 to 2.2.6 and 2.0.0 to 2.0.12, the MSNIP dissector misuses a NULL pointer. This was addressed in epan/dissectors/packet-msnip.c by validating an IPv4 address.
https://www.wireshark.org/security/wnpa-sec-2017-30.html
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=13725
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=1678