https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=6375
Summary: GPRS RLCMAC dissector not handling valid PDU
Product: Wireshark
Version: 1.6.1
Platform: All
OS/Version: All
Status: NEW
Severity: Minor
Priority: Low
Component: Wireshark
AssignedTo: bugzilla-admin@xxxxxxxxxxxxx
ReportedBy: wireshark@xxxxxxxxxxxxxxx
Build Information:
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In packet-gsm_rlcmac.c around line 1157, the table describing < EGPRS Ack/Nack
Description > structure finishes with the CRBB fields, but the 3GPP
specification (44.060) defines that this is followed by a URBB.
If a PDU with a URBB present is dissected, it throws a dissector error. The
fix for this may be non-trivial, as the rules for calculating the expected
length of URBB are not simple (see the bottom of Table 12.3.1.2 in 44.060).
I will upload a sample trace, but it will require a wireshark patch before it
can be read (it uses an enhanced gsmtap format which is not yet supported by
wireshark).
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