linux-kernel - Re: [PATCH] Fix kernel NULL pointer dereference in xen-blkfront

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Date:	Wed, 4 Mar 2009 11:16:41 +0100
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Kris Shannon <kris@...nnon.id.au>,
	Linux Kernel List <linux-kernel@...r.kernel.org>,
	Xen-devel <xen-devel@...ts.xensource.com>
Subject: Re: [PATCH] Fix kernel NULL pointer dereference in xen-blkfront

On Tue, Mar 03 2009, Jeremy Fitzhardinge wrote:
> Kris Shannon wrote:
>> When booting Xen Dom0 on a pre-release 3.2.1 hypervisor the system Oopses on a
>> "Unable to handle kernel NULL pointer dereference" in xenwatch.
>>
>> From the backtrace it looks like backend_changed is calling bdget_disk
>> with a NULL pointer.  Checking for NULL and returning ENODEV instead
>> allows the kernel to boot.
>>   
>
> Thanks, applied.  (BTW, please cc: me and xen-devel for Xen-related  
> reports.)
>
> Jens: could you pull this; I think this is probably -rc material.  This  
> crash just started happening, so I guess its a side-effect of some core  
> kernel change.
>
> The following changes since commit c7241227f61ca6606a7fa3555391360d92bd8d9b:
>  Jens Axboe (1):
>        xen/blkfront: use blk_rq_map_sg to generate ring entries
>
> are available in the git repository at:
>
>  git://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xen.git xen/frontend/blkfront
>
> Kris Shannon (1):
>      Fix kernel NULL pointer dereference in xen-blkfront
>
> drivers/block/xen-blkfront.c |    2 ++
> 1 files changed, 2 insertions(+), 0 deletions(-)

Sure, pulled.

-- 
Jens Axboe

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