linux-kernel - Re: [PATCH 1/1] PCI: hotplug/cpqphp, fix NULL dereference

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Date:	Wed, 9 Jun 2010 15:34:31 -0700
From:	Greg KH <greg@...ah.com>
To:	Jiri Slaby <jslaby@...e.cz>
Cc:	jbarnes@...tuousgeek.org, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org, jirislaby@...il.com
Subject: Re: [PATCH 1/1] PCI: hotplug/cpqphp, fix NULL dereference

On Wed, Jun 09, 2010 at 10:31:13PM +0200, Jiri Slaby wrote:
> There are devices out there which are PCI Hot-plug controllers with
> compaq PCI IDs, but are not bridges, hence have pdev->subordinate
> NULL. But cpqphp expects the pointer to be non-NULL.
> 
> Add a check to the probe function to avoid oopses like:
> BUG: unable to handle kernel NULL pointer dereference at 00000050
> IP: [<f82e3c41>] cpqhpc_probe+0x951/0x1120 [cpqphp]
> *pdpt = 0000000033779001 *pde = 0000000000000000
> ...
> 
> The device here was:
> 00:0b.0 PCI Hot-plug controller [0804]: Compaq Computer Corporation PCI Hotplug Controller [0e11:a0f7] (rev 11)
> 	Subsystem: Compaq Computer Corporation Device [0e11:a2f8]
> 
> Signed-off-by: Jiri Slaby <jslaby@...e.cz>
> Cc: Greg KH <greg@...ah.com>

Acked-by: Greg Kroah-Hartman <gregkh@...e.de>

thanks,

greg k-h
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