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

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Message-ID: <CAGXu5jLpey7HZH-oZwsMTR3hZ9Cdhp9HXu4bLLSF9o9RtPR4zA@mail.gmail.com>
Date:	Tue, 24 Feb 2015 08:29:57 -0800
From:	Kees Cook <keescook@...omium.org>
To:	Ameen Ali <ameenali023@...il.com>
Cc:	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>, boaz@...xistor.com,
	jack@...e.cz, Jens Axboe <axboe@...com>,
	linux-s390@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] dcssblk.c : Array index 'i' is used before limits check.

On Tue, Feb 24, 2015 at 7:57 AM, Ameen Ali <ameenali023@...il.com> wrote:
> Signed-off-by : Ameen Ali <Ameenali023@...il.com>

Can you include some text in the commit message body explaining the
meaning of the change? (For example 'avoid out-of-bounds-read by
checking count before indexing' or something like that?)

Reviewed-by: Kees Cook <keescook@...omium.org>

Thanks!

-Kees

> ---
>  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++) {
>                 for (j = i; (buf[j] != ':') &&
>                         (buf[j] != '\0') &&
>                         (buf[j] != '\n') &&
> --
> 2.1.0
>



-- 
Kees Cook
Chrome OS Security
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