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

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Date:	Tue, 09 Dec 2008 00:47:53 -0500
From:	Jeff Garzik <jeff@...zik.org>
To:	Jiri Slaby <jirislaby@...il.com>
CC:	Tejun Heo <tj@...nel.org>, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, Jeff Garzik <jgarzik@...hat.com>,
	Alexandru Romanescu <a_romanescu@...oo.co.uk>
Subject: Re: [PATCH 1/1] ATA: piix, fix pointer deref on suspend

Jiri Slaby 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.
> 
> Solves:
> BUG: unable to handle kernel NULL pointer dereference at 0000000000000000
> IP: [<ffffffff8043da97>] piix_pci_device_suspend+0x117/0x230
> 
> Signed-off-by: Jiri Slaby <jirislaby@...il.com>
> Cc: Jeff Garzik <jgarzik@...hat.com>
> Cc: Alexandru Romanescu <a_romanescu@...oo.co.uk>
> Cc: Tejun Heo <tj@...nel.org>
> ---
>  drivers/ata/ata_piix.c |    9 ++++++++-
>  1 files changed, 8 insertions(+), 1 deletions(-)

applied #upstream-fixes (until someone creates a better patch...)


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