Wireshark-bugs: [Wireshark-bugs] [Bug 5891] New: Some SMB requests are not decoded when "Validat

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From: bugzilla-daemon@xxxxxxxxxxxxx
Date: Wed, 4 May 2011 14:13:10 -0700 (PDT)
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=5891

           Summary: Some SMB requests are not decoded when "Validate the
                    TCP Checksum" preference is enabled
           Product: Wireshark
           Version: 1.4.6
          Platform: Other
        OS/Version: Windows XP
            Status: NEW
          Severity: Normal
          Priority: Low
         Component: Wireshark
        AssignedTo: wireshark-bugs@xxxxxxxxxxxxx
        ReportedBy: fschorr@xxxxxxxxxxx


Created an attachment (id=6285)
 --> (https://bugs.wireshark.org/bugzilla/attachment.cgi?id=6285)
I am attaching a 2 frame capture that shows the problem.

Build Information:
Version 1.4.6 (SVN Rev 36706 from /trunk-1.4)

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+ 2.16.6, 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 2.10.3,
with
Gcrypt 1.4.6, with MIT Kerberos, with GeoIP, with PortAudio V19-devel (built
Apr
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

Wireshark is Open Source Software released under the GNU General Public
License.

Check the man page and http://www.wireshark.org for more information
--
The problem occurs when the sending host puts the 4 bytes of NetBIOS in a frame
(see frame 1) and the SMB layer information associated with the NetBIOS layer
in a separate (next) frame (frame 2) AND the capture was taken on the sending
host which would cause TCP checksum errors in both frames. If the TCP
Preference "Validate the TCP checksum if possible" is selected, the SMB frame
will not be decoded (frame 2).  

If the TCP Preference "Validate the TCP checksum if possible" is NOT selected,
the SMB information is properly decoded.

I am attaching a 2 frame capture that shows the problem.

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