https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=6237
Summary: packet-gsm_a_rr - misdecoding 3G Neighbour Cell
Information Element in SI2quater message due to a
coding typo
Product: Wireshark
Version: 1.6.1
Platform: All
OS/Version: All
Status: NEW
Severity: Normal
Priority: Low
Component: Wireshark
AssignedTo: bugzilla-admin@xxxxxxxxxxxxx
ReportedBy: jqr@xxxxxxxxxxxxxx
Created an attachment (id=6824)
--> (https://bugs.wireshark.org/bugzilla/attachment.cgi?id=6824)
diff file to fix in 1.61
Build Information:
Version 1.6.0 (SVN Rev 37592 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 (64-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, without
SMI, with c-ares 1.7.1, with Lua 5.1, without Python, with GnuTLS 2.10.3, with
Gcrypt 1.4.6, without Kerberos, with GeoIP, with PortAudio V19-devel (built Jun
7 2011), with AirPcap.
Running on 64-bit Windows 7, build 7600, 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
Wireshark is Open Source Software released under the GNU General Public
License.
Check the man page and http://www.wireshark.org for more information
--
A probable typo when copying Table 9.1.54.1a. from 3GPP TS 44.018 into the
packet-gsm_a_rr.c file has Wireshark mis-decoding the 3G Neighbour Cell
Information Element (and consequently the rest of the message) when
NR_OF_FDD_CELLS = 4 (and only 4).
>From the source code:
/*
* [3] 10.5.2.1e Cell selection indicator after release of all TCH and SDCCH
*/
static const guint8
convert_n_to_p[32] = { 0, 10, 19, 28, 26, 44, 52, 60, 67, 74, 81, 88, 95,
102, 109, 116,
122, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0};
>From the 3GPP literature, the element for n=4 should be 36, not 26.
The table represents the size in bits of the FDD_CELL_INFORMATION field, and if
it is incorrect, the element and the rest of the message will be incorrectly
decoded.
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