linux-kernel - Re: [PATCH] dcssblk.c : Array index 'i' is used before limits check.

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Message-ID: <20150225092631.GA4271@osiris>
Date:	Wed, 25 Feb 2015 10:26:31 +0100
From:	Heiko Carstens <heiko.carstens@...ibm.com>
To:	Ameen Ali <ameenali023@...il.com>
Cc:	schwidefsky@...ibm.com, linux390@...ibm.com, keescook@...omium.org,
	wsa@...-dreams.de, linux-s390@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dcssblk.c : Array index 'i' is used before limits check.

On Tue, Feb 24, 2015 at 06:41:50PM +0200, Ameen Ali wrote:
> avoid out-of-bounds-read by checking count before indexing.
> 
> Signed-off-by : Ameen Ali <Ameenali023@...il.com>
> ---
>  drivers/s390/block/dcssblk.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/s390/block/dcssblk.c b/drivers/s390/block/dcssblk.c
> index 96128cb..da21281 100644
> --- a/drivers/s390/block/dcssblk.c
> +++ b/drivers/s390/block/dcssblk.c
> @@ -547,7 +547,7 @@ dcssblk_add_store(struct device *dev, struct device_attribute *attr, const char
>  	 * parse input
>  	 */
>  	num_of_segments = 0;
> -	for (i = 0; ((buf[i] != '\0') && (buf[i] != '\n') && i < count); i++) {
> +	for (i = 0; (i < count && (buf[i] != '\0') && (buf[i] != '\n')); i++) {

Applied, thanks!

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