Build Information:
TShark (Wireshark) 2.5.1 (v2.5.1rc0-40-g4be24cfc)

Copyright 1998-2018 Gerald Combs <gerald@wireshark.org> and contributors.
License GPLv2+: GNU GPL version 2 or later <http://www.gnu.org/licenses/old-licenses/gpl-2.0.html>
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Compiled (64-bit) without libpcap, with GLib 2.42.2, with zlib 1.2.8, without
SMI, without c-ares, without Lua, without GnuTLS, with Gcrypt 1.6.3, without
Kerberos, without GeoIP, without nghttp2, without LZ4, without Snappy, without
libxml2.

Running on Linux 3.17.4-301.fc21.x86_64, with Intel(R) Xeon(R) CPU          
E5530  @ 2.40GHz (with SSE4.2), with 24093 MB of physical memory, with locale
en_US.UTF-8, with Gcrypt 1.6.3, with zlib 1.2.8.

Built using gcc 4.9.2 20150212 (Red Hat 4.9.2-6).

--
A problem was found by the oss-fuzz project:
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=6159

Opening attached pcap crash in rq17 cause of NULL ipmi_get_hdr(pinfo), backtrace:

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff451b4e9 in rq17 (tvb=0xfbec10, pinfo=0xfabb08, tree=0xfbeb70) at packet-ipmi-picmg.c:1208
1208		guint to_shmm = ipmi_get_hdr(pinfo)->rs_sa == 0x20;
(gdb) bt
#0  0x00007ffff451b4e9 in rq17 (tvb=0xfbec10, pinfo=0xfabb08, tree=0xfbeb70) at packet-ipmi-picmg.c:1208
#1  0x00007ffff4516352 in dissect_ipmi_cmd (tvb=tvb@entry=0xfbe7f0, pinfo=pinfo@entry=0xfabb08, tree=tree@entry=0xfbbd20, hf_parent_item=hf_parent_item@entry=66273, ett_tree=ett_tree@entry=15368, ctx=ctx@entry=0x7fffffffcf70)
    at packet-ipmi.c:738
#2  0x00007ffff4516c1a in do_dissect_ipmb (tvb=0xfbe7f0, pinfo=0xfabb08, tree=0xfbbd20, hf_parent_item=66273, ett_tree=15368, arg=0x0) at packet-ipmi.c:1698
#3  0x00007ffff40c8f3b in call_dissector_through_handle (handle=handle@entry=0x7fffec16df60, tvb=tvb@entry=0xfbe7f0, pinfo=pinfo@entry=0xfabb08, tree=tree@entry=0xfbbd20, data=data@entry=0x0) at packet.c:679
#4  0x00007ffff40c9ed2 in call_dissector_work (handle=0x7fffec16df60, tvb=0xfbe7f0, pinfo_arg=0xfabb08, tree=0xfbbd20, add_proto_name=1, data=0x0) at packet.c:764
#5  0x00007ffff40cbaf2 in call_dissector_with_data (handle=<optimized out>, tvb=0xfbe7f0, pinfo=0xfabb08, tree=0xfbbd20, data=<optimized out>) at packet.c:3090
#6  0x00007ffff45202ed in dissect_ipmi_session (tvb=0xfbe6a0, pinfo=0xfabb08, tree=0xfbbd20, data=<optimized out>) at packet-ipmi-session.c:239
(...)