Wireshark · Wireshark-bugs: [Wireshark-bugs] [Bug 12639] New: DCE/RPC dissector fragments reassembling error

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Bug ID	12639
Summary	DCE/RPC dissector fragments reassembling error
Product	Wireshark
Version	2.0.4
Hardware	x86
OS	Windows 7
Status	UNCONFIRMED
Severity	Major
Priority	Low
Component	Dissection engine (libwireshark)
Assignee	bugzilla-admin@wireshark.org
Reporter	matthias.breuninger@etas.com

Created attachment 14748 [details]
PNG - reassembled fragments with bad size

Build Information:
Version 2.0.4-ETAS-NE-r102 (Git Rev Unknown from unknown)

Copyright 1998-2016 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) with GTK+ 2.24.23, with Cairo 1.12.16, with Pango 1.36.8,
with
WinPcap (4_1_3), with libz 1.2.8, with GLib 2.42.0, with SMI 0.4.8, with c-ares
1.11.0, with Lua 5.2, with GnuTLS 3.2.15, with Gcrypt 1.6.2, with MIT Kerberos,
with GeoIP, with PortAudio V19-devel (built Jun 28 2016), with AirPcap.

Running on 64-bit Windows 7 Service Pack 1, build 7601, with locale
German_Germany.1252, with WinPcap version 4.1.3 (packet.dll version
4.1.0.2980),
based on libpcap version 1.0 branch 1_0_rel0b (20091008), with GnuTLS 3.2.15,
with Gcrypt 1.6.2, without AirPcap.
Intel(R) Core(TM) i7-4790 CPU @ 3.60GHz (with SSE4.2), with 16324MB of physical
memory.


Built using Microsoft Visual C++ 12.0 build 40629

Wireshark is Open Source Software released under the GNU General Public
License.

Check the man page and http://www.wireshark.org for more information.
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I have a problem with a sub-dissector based on the DCE/RPC protocl when DCE/RPC
reassembles multiple TCP segments to multiple DCE/RPC fragments.

I attached a screenshot in which 3 TCP segments are being reassembled to 2
DCE/RPC fragments. The sum of the TCP payload is 16384 Bytes, however, the
DCE/RPC dissector ends up to create 2 fragments with a sum of 20016 Bytes. As a
consequence my sub-dissector fails.

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