netdev - Crash in CIPSO_V4_TAG

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Message-ID: <20120713180841.2b202cf8@pyramind.ukuu.org.uk>
Date:	Fri, 13 Jul 2012 18:08:41 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	netdev@...r.kernel.org
Subject: Crash in CIPSO_V4_TAG_LOCAL handling

DaveM asked that this goes direct to the list so ...

Looking at some static code analyser output and the results seem valid on
this one:

ip_options_compile called with skb = NULL and an IPOPT_CIPSO option calls
into cipso_v4_validate, which if the option is CIPSO_V4_TAG_LOCAL then
dereferences skb->dev and explodes.

All the other cases appear to correctly avoid or check it versus NULL

Alan
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