https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=6101
Summary: CSN Ack/Nack Description wrongly handled in
gsm_rlcmac_dl dissector (3GPP TS 44.060)
Product: Wireshark
Version: 1.7.x (Experimental)
Platform: x86
OS/Version: Windows XP
Status: NEW
Severity: Normal
Priority: Low
Component: Wireshark
AssignedTo: bugzilla-admin@xxxxxxxxxxxxx
ReportedBy: lhaessler@xxxxxxxxxxxxxxxxxx
Build Information:
Version 1.7.0-TEST_BUILD_LHA-01 (SVN Rev Unknown from unknown)
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
6 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
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CSN description of IE Ack/Nack Description (3GPP TS 44.060) is not correctly
managed by CSN decoder.
That's lead to wrong decoding of GPRS RLC/MAC control blocks (Packet Uplink
Ack/Nack); the following error is observed: [Dissector bug, protocol GSM RLC
MAC: tvbuff.c:1739: failed assertion "DISSECTOR_ASSERT_NOT_REACHED"]
Please find attached a capture file (gprs.pcap) showing the bug with wireshark
v1.6.0.
Two issues observed:
1) FINAL_ACK_INDICATION bit not correctly displayed
2) 64 bits RECEIVED_BLOCK_BITMAP not correcly decoded
Please also find the patch fixing those issues (rlcmac_csn_acknack.patch)
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