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Chris Maynard changed bug 9482

What	Removed	Added
Attachment #12187 Flags		review_for_checkin?
Status	CONFIRMED	IN_PROGRESS
Assignee	bugzilla-admin@wireshark.org	christopher.maynard@gtech.com

Comment # 1 on bug 9482 from Chris Maynard

Created attachment 12187 [details]
Avoid attempting FC dissection if the data argument to dissect_fc() is NULL.

10:37:01          Warn Dissector bug, protocol FC, in packet 7668:
STATUS_ACCESS
_VIOLATION: dissector accessed an invalid memory address

This happens because in dissect_ppi(), the dlt is assigned the corrupted value
of 224 instead of the correct value of 105, which causes dissector_try_uint()
to call the FC dissector with a NULL data argument passed to dissect_fc().

This patch fixes this by assuming that if the data argument is NULL that the
traffic isn't actually Fibre Channel data.  Posting the patch here for
review/comments in case this isn't a valid assumption.

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