It may be possible to make Wireshark crash by injecting a malformed packet onto the wire or by convincing someone to read a malformed packet trace file.
Created wireshark tracking bugs for this issue:
Affects: fedora-all [bug 1625927]
Created attachment 1487126 [details]
Not reproducible on RHEL6/7. Patch looks slightly applicable just due to the wmem_new0, but I'm guessing that may just be a memleak. No valgrind errors.