DTLS dissector crash

This issue was migrated from bug 8111 in our old bug tracker.

Original bug information:

Reporter: Laurent Butti
Status: RESOLVED FIXED
Product: Wireshark
Component: GTK+ UI
OS: All
Platform: x86-64
Version: 1.8.4

Attachments:

packet-dtls.pcap: Capture file that causes the crash.
rejectInvalidStartOffset.patch: rough idea for a fix
set-tot-len-sanity.patch: Sanity checks in fragment_set_tot_len
set-tot-len-sanity_revert_dtls_call_order_v2.patch: Evan's sanity checks with NULL check, revert DTLS call order