[PATCH 4/4] staging: lustre: Fix potential buffer underflow

[Dan Carpenter]

On Tue, Sep 09, 2014 at 12:12:01AM +0200, Hugues wrote:
> Fix potential buffer underflow
> 
> When the string 'name' start with a '-' ptr == name and so --ptr will
> underflow, this patch corrected this by checking ptr before decrementing.

Good eye.  Please fix up the changelog and send it inline etc and
resend.  I've added Oleg and Andreas to the CC list so that this doesn't
get lost.

regards,
dan carpenter

> >From 5786040323bd1dc3149fb4afbea9f01e2bf4cfdf Mon Sep 17 00:00:00 2001
> From: Hugues Morisset <morisset.hugues at gmail.com>
> Date: Mon, 8 Sep 2014 22:59:04 +0200
> Subject: [PATCH 4/4] staging: lustre: Fix potential buffer underflow
> 
> Signed-off-by: Hugues Morisset <morisset.hugues at gmail.com>
> ---
>  drivers/staging/lustre/lustre/include/obd.h | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/staging/lustre/lustre/include/obd.h b/drivers/staging/lustre/lustre/include/obd.h
> index 409eae6..bb67e40 100644
> --- a/drivers/staging/lustre/lustre/include/obd.h
> +++ b/drivers/staging/lustre/lustre/include/obd.h
> @@ -677,7 +677,12 @@ static inline int is_osp_on_mdt(char *name)
>  	if (strncmp(ptr + 1, "MDT", 3) != 0)
>  		return 0;
>  
> -	while (*(--ptr) != '-' && ptr != name);
> +	if (ptr == name)
> +		return 0;
> +
> +	--ptr;
> +	while (ptr != '-' && ptr != name)
> +		--ptr;
>  
>  	if (ptr == name)
>  		return 0;
> -- 
> 2.1.0
> 

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