Wireshark-bugs: [Wireshark-bugs] [Bug 5214] New: GSM: Cell Channel Description, range 1024 forma
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=5214
Summary: GSM: Cell Channel Description, range 1024 format
Product: Wireshark
Version: 1.5.x (Experimental)
Platform: x86
OS/Version: Windows XP
Status: NEW
Severity: Normal
Priority: Low
Component: TShark
AssignedTo: wireshark-bugs@xxxxxxxxxxxxx
ReportedBy: vincent.helfre@xxxxxxx
Build Information:
Version 1.5.0 (SVN Rev 33771 from /trunk)
Copyright 1998-2010 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 with GTK+ 2.16.6, (32-bit) with GLib 2.22.4, with WinPcap (version
unknown), with libz 1.2.3, without POSIX capabilities, without libpcre, with
SMI
0.4.8, with c-ares 1.7.1, with Lua 5.1, without Python, with GnuTLS 2.8.5, with
Gcrypt 1.4.5, with MIT Kerberos, with GeoIP, with PortAudio V19-devel (built
Aug
16 2010), 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 2.8.5, Gcrypt 1.4.5, without AirPcap.
Built using Microsoft Visual C++ 9.0 build 30729
Wireshark is Open Source Software released under the GNU General Public
License.
Check the man page and http://www.wireshark.org for more information.
--
There is a small error in the packet-gsm_a_rr.c Revision 33692, which results
in incorrect decoding of List of ARFCN in BCCH frequency list.
When the range 1024 is selected, it can happen that 2 bytes need to be read for
W1, and also for W2. In the current version, when W1 ends on a byte boundary,
W2 will get an incorrect value, since it will be truncated by 1 bit.
The fix is very simple: Replace line 885
if (wsize > wbits) { /* need to extract more bits from the
next octet */
with:
while (wsize > wbits) { /* need to extract more bits from
the next octet */
An example of SI2bis decoding is:
06 02 87 f7 fb 02 3e ff 41 40 00 00 00 00 00 00 00 00 41 00 00 2b
This should result in
List of ARFCNs = 0 1000 1005 1010 1015 1020 1023
--
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