Wireshark · Wireshark-bugs: [Wireshark-bugs] [Bug 3473] New: VLAN dissector passes FCS to sub-dissectors

[bugzilla-daemon@xxxxxxxxxxxxx]

https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=3473

           Summary: VLAN dissector passes FCS to sub-dissectors
           Product: Wireshark
           Version: 1.1.x (Experimental)
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Critical
          Priority: Medium
         Component: Wireshark
        AssignedTo: wireshark-bugs@xxxxxxxxxxxxx
        ReportedBy: artem.tamazov@xxxxxxxxxxx


Build Information:
TShark 1.1.4-tlab-pwe3-atm-plus-tmp-satop-cesopsn (SVN Rev unknown)

Copyright 1998-2009 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 GLib 2.20.0, with WinPcap (version unknown), with libz 1.2.3,
without POSIX capabilities, with libpcre 7.0, with SMI 0.4.8, with c-ares
1.6.0,
without Lua, with GnuTLS 2.6.4, with Gcrypt 1.4.4, with MIT Kerberos, with
GeoIP.

Running on Windows XP Service Pack 2, build 2600, with WinPcap version 4.0.2
(packet.dll version 4.0.0.1040), based on libpcap version 0.9.5, GnuTLS 2.6.4,
Gcrypt 1.4.4.

Built using Microsoft Visual C++ 7.10 build 3077
--
Curently, VLAN dissector assumes that there is no FCS in the packet. It passes
everything to sub-dissectors, and, if something left after them, displays the
rest as a trailer. 

This creates problems for sub-dissectors which unable to deduce amount of data
to be dissected, like SAToP or MPLS PW ATM.

According to IEEE Std 802.1Q, 4-byte FCS always present at the end of VLAN
frame.


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