Wireshark-bugs: [Wireshark-bugs] [Bug 6266] New: EGPRS_PACKET_DOWNLINK_ACK_NACK gsm_rlcmac_ul ca
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From: bugzilla-daemon@xxxxxxxxxxxxx
Date: Fri, 26 Aug 2011 07:05:05 -0700 (PDT)
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=6266

           Summary: EGPRS_PACKET_DOWNLINK_ACK_NACK gsm_rlcmac_ul causing
                    error when decoding CRBB
           Product: Wireshark
           Version: 1.6.1
          Platform: x86
        OS/Version: Windows XP
            Status: NEW
          Severity: Normal
          Priority: Low
         Component: Wireshark
        AssignedTo: bugzilla-admin@xxxxxxxxxxxxx
        ReportedBy: angelbartomeu@xxxxxxxxx


Created an attachment (id=6873)
 --> (https://bugs.wireshark.org/bugzilla/attachment.cgi?id=6873)
failed assertion "DISSECTOR_ASSERT_NOT_REACHED" error decoding EGPRS ack/Nack

Build Information:
Version 1.6.1 (SVN Rev 38096 from /trunk-1.6)

Copyright 1998-2011 Gerald Combs <gerald@xxxxxxxxxxxxx> and contributors.
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 (32-bit) with GTK+ 2.22.1, with GLib 2.26.1, with WinPcap (version
unknown), with libz 1.2.5, without POSIX capabilities, without libpcre, with
SMI
0.4.8, with c-ares 1.7.1, with Lua 5.1, without Python, with GnuTLS 2.10.3,
with
Gcrypt 1.4.6, with MIT Kerberos, with GeoIP, with PortAudio V19-devel (built
Jul
18 2011), with AirPcap.

Running on Windows XP Service Pack 3, build 2600, with WinPcap version 4.1.2
(packet.dll version 4.1.0.2001), based on libpcap version 1.0 branch 1_0_rel0b
(20091008), GnuTLS 2.10.3, Gcrypt 1.4.6, without AirPcap.

Built using Microsoft Visual C++ 9.0 build 21022
--
[Dissector bug, protocol GSM RLC MAC: tvbuff.c:1636: failed assertion
"DISSECTOR_ASSERT_NOT_REACHED"] error decoding EGPRS packet downling Ack/Nack.
It seems that the error is caused when decoding de CRBB bit stream as defined
in packet-gsm_rlcmac.c:1157:

M_LEFT_VAR_BMP  (EGPRS_AckNack_t, CRBB, CRBB_LENGTH, 0),

I was not able to go deeper into the problem as I am not familiar with the CSN
implementation. 

This error occurs also in the svn version of the code compiled under windows XP
See attached file as a example. 

This bug might be related to Bug 6101.

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