Wireshark-bugs: [Wireshark-bugs] [Bug 5475] New: gsm_a_dtap: incorrect "Extraneous Data" when de
Date: Wed, 8 Dec 2010 12:14:32 -0800 (PST)
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=5475

           Summary: gsm_a_dtap: incorrect "Extraneous Data" when decoding
                    Packet Flow Identifier
           Product: Wireshark
           Version: 1.4.2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: Low
         Component: Wireshark
        AssignedTo: [email protected]
        ReportedBy: [email protected]


Build Information:
wireshark 1.4.2

Copyright 1998-2010 Gerald Combs <[email protected]> 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+ 2.20.1, with GLib 2.24.1, with libpcap 1.1.1, with
libz 1.2.3, without POSIX capabilities, without libpcre, without SMI, without
c-ares, without ADNS, with Lua 5.1, without Python, with GnuTLS 2.8.6, with
Gcrypt 1.4.4, without Kerberos, without GeoIP, without PortAudio, without
AirPcap.

Running on Linux 2.6.34.7-0.5-default, with libpcap version 1.1.1, with libz
1.2.3, GnuTLS 2.8.6, Gcrypt 1.4.4.

Built using gcc 4.5.0 20100604 [gcc-4_5-branch revision 160292].

--
Due to a change applied to packet-gsm_a_gm.c:de_sm_pflow_id() after Wireshark
version 1.2.x an Activate PDP Context Accept message which contains a
Packet Flow Identifier IE is now incorrectly marked as containing
"Extraneous Data" since current_offset is no longer incremented accordingly.

Using
echo 000000 8a 42 03 0b 23 91 1f 93 96 8e e8 74 07 01 01 04 2b 06 01 21 0a 00
00 03 27 14 80 80 21 10 03 00 00 10 81 06 0a 00 00 01 83 06 0a 00 00 02 34 01
01 | text2pcap -l 147 /dev/stdin extrdata.pcap
and Decode User DLT 0 as gsm_a_dtap Wireshark 1.4.2 displays
...
    Packet Flow Identifier
        Element ID: 52
        Length: 1
        0... .... = Spare bit(s): 0
        .000 0001 = Packet Flow Identifier (PFI): Signaling (1)
        Extraneous Data

while Wireshark 1.2.8 displays
...
    Packet Flow Identifier
        Element ID: 52
        Length: 1
        Packet Flow Identifier: (1) Signaling

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