https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=14966

--- Comment #2 from Jaap Keuter <jaap.keu...@xs4all.nl> ---
Problem still present in master HEAD as well.

dissect_coap() uses PINFO_FD_VISITED to determine is proto data needs to be
added or is already present for the packet. This assumption is wrong; it should
try to get the data, if that fails data should be allocated. Only then you can
use the pointer. 

The same problem occurs in packet-dmp.c (which triggers a DISSECTOR_ASSERT), in
register_dmp_id().

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