linux-kernel - Re: [PATCH] [dm]fix NULL pointer in dm_exception_store

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Message-ID: <20160201204253.GD18440@kroah.com>
Date:	Mon, 1 Feb 2016 12:42:53 -0800
From:	Greg KH <greg@...ah.com>
To:	DingXiang <dingxiang@...wei.com>
Cc:	snitzer@...hat.com, stable@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] [dm]fix NULL pointer in dm_exception_store_create() when
 create dm device

On Mon, Feb 01, 2016 at 03:05:58PM +0800, DingXiang wrote:
> In some conditions(such as umount fs failed),origin path or origin bdev or both of the two is same
> as cow's.If this happens, origin dev will be freed when get cow dev in function "dm_get_device" ,
> then "s->origin->dev" which used by "dm_exception_store_create" will be a NULL pointer.
> 
> Signed-off-by:Ding Xiang <dingxiang@...wei.com>
> ---
>  drivers/md/dm-snap.c |   10 ++++++++++
>  1 files changed, 10 insertions(+), 0 deletions(-)

<formletter>

This is not the correct way to submit patches for inclusion in the
stable kernel tree.  Please read Documentation/stable_kernel_rules.txt
for how to do this properly.

</formletter>