linux-kernel - Re: [PATCH 1/1] ATA: piix, fix pointer deref on suspend

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Message-ID: <20081203101342.5041f3fb@lxorguk.ukuu.org.uk>
Date:	Wed, 3 Dec 2008 10:13:42 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Jiri Slaby <jirislaby@...il.com>
Cc:	Tejun Heo <tj@...nel.org>, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, Jiri Slaby <jirislaby@...il.com>,
	Jeff Garzik <jgarzik@...hat.com>,
	Alexandru Romanescu <a_romanescu@...oo.co.uk>
Subject: Re: [PATCH 1/1] ATA: piix, fix pointer deref on suspend

On Wed,  3 Dec 2008 09:13:46 +0100
Jiri Slaby <jirislaby@...il.com> wrote:

> Hi,
> 
> I've found this issue in the mmotm 2008-12-02-17-08.
> 
> --
> 
> Commit
> ata_piix: add borked Tecra M4 to broken suspend list
> introduced DMI variables checking, but they can be null, so that
> we possibly dereference null.
> 
> Check if they are null and avoid checks in that case.

Gak.. Add some kind of helper to the dmi code to do this and do the
comparison.
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