linux-kernel - Re: [PATCH] xfs:xfs_dir2_node.c: pointer use before check for null

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Date:	Wed, 23 Oct 2013 07:33:22 +1100
From:	Dave Chinner <david@...morbit.com>
To:	Denis Efremov <yefremov.denis@...il.com>
Cc:	Ben Myers <bpm@....com>, ldv-project@...uxtesting.org,
	Alex Elder <elder@...nel.org>, linux-kernel@...r.kernel.org,
	xfs@....sgi.com
Subject: Re: [PATCH] xfs:xfs_dir2_node.c: pointer use before check for null

On Tue, Oct 22, 2013 at 11:36:15AM +0400, Denis Efremov wrote:
> Reorder of assert and args pointer dereference.
> 
> Found by Linux Driver Verification project (linuxtesting.org) -
> PVS-Studio analyzer.
> 
> Signed-off-by: Denis Efremov <yefremov.denis@...il.com>
> ---
>  fs/xfs/xfs_dir2_node.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/fs/xfs/xfs_dir2_node.c b/fs/xfs/xfs_dir2_node.c
> index 4c3dba7..0ba7382 100644
> --- a/fs/xfs/xfs_dir2_node.c
> +++ b/fs/xfs/xfs_dir2_node.c
> @@ -1365,8 +1365,8 @@ xfs_dir2_leafn_split(
>  	 * Allocate space for a new leaf node.
>  	 */
>  	args = state->args;
> -	mp = args->dp->i_mount;
>  	ASSERT(args != NULL);
> +	mp = args->dp->i_mount;

Just remove the ASSERT. Either way we are going to panic.

Cheers,

Dave.
-- 
Dave Chinner
david@...morbit.com
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