Wireshark-bugs: [Wireshark-bugs] [Bug 10334] New: 802.11 BA sequence number decode is broken

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From: bugzilla-daemon@xxxxxxxxxxxxx
Date: Fri, 01 Aug 2014 14:08:42 +0000
Bug ID 10334
Summary 802.11 BA sequence number decode is broken
Classification Unclassified
Product Wireshark
Version 1.99.x (Experimental)
Hardware x86
OS Windows 7
Status UNCONFIRMED
Severity Normal
Priority Low
Component Dissection engine (libwireshark)
Assignee [email protected]
Reporter [email protected] 

Created attachment 12946 [details]
Example frame

Build Information:
The reporting of missing frames after decoding the BA bitmap is incorrect.

--
The sequence number is only 12 bits and if (ssn + f) is greater than 4095 it
should be wrapped.

The trivial fix is to change (ssn + f) to ((ssn + f) & 0x0fff))

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