Wireshark-bugs: [Wireshark-bugs] [Bug 11634] ISIS Hello trigger Error/Malformed Packet length 16
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From: bugzilla-daemon@xxxxxxxxxxxxx
Date: Tue, 27 Oct 2015 08:55:07 +0000

Comment # 5 on bug 11634 from 
(In reply to Jim Young from comment #4)
> Alexis,
> 
> Using historic packages from
> https://www.wireshark.org/download/win64/all-versions/
> I can confirm that:
> 
> 1.11.2 (5033435add3d880b188810361fcb6bfaf0fba4b1) is ok.
> 
> 1.11.3 (1dd5d3a6aae79e6a1f566a9600264d8e91ffedd6) has the issue.
> 
> It looks like 1.11.2 assumed (correctly) that the PDU starts at frame offset
> 0x11, but with 1.11.3 PDU we are 8 octets further into at frame offset 0x19.
> The issue is the 8 octets that comprise the "ISO 10589 ISIS InTRA Domain
> Routeing Information Exchange Protocol" tree objects are no longer available
> to dissect_hello_checksum_clv() in the latter version.  These initial 8
> octets appear to be a required part of the PDU for purposes of checksum
> calculation.
> 
> I'm guessing with fresh eyes it should be possible to find issue if the diff
> between these two versions.

nice !
it will be easy to make a bisect (need only time to build...)
There is only 2407 commit ;-)

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