linux-kernel - Re: [PATCH 2/2 v2] ATA: piix, fix pointer deref on suspend

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Date:	Thu, 11 Dec 2008 12:27:12 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Jiri Slaby <jirislaby@...il.com>
Cc:	jeff@...zik.org, linux-kernel@...r.kernel.org, jirislaby@...il.com,
	jgarzik@...hat.com, a_romanescu@...oo.co.uk, tj@...nel.org,
	alan@...rguk.ukuu.org.uk
Subject: Re: [PATCH 2/2 v2] ATA: piix, fix pointer deref on suspend

On Tue,  9 Dec 2008 21:52:28 +0100
Jiri Slaby <jirislaby@...il.com> wrote:

> 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.
> 
> Solves:
> BUG: unable to handle kernel NULL pointer dereference at 0000000000000000
> IP: [<ffffffff8043da97>] piix_pci_device_suspend+0x117/0x230

This already got fixed, the nasty way.

I queued "DMI: add dmi_match".  We can later switch the piix nastyfix
over to the nicefix as a cleanup.

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