linux-kernel - Re: [PATCH 1/2] Input: cyttsp

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Message-ID: <20130617213858.GA2805@dztty>
Date:	Mon, 17 Jun 2013 22:38:59 +0100
From:	Djalal Harouni <tixxdz@...ndz.org>
To:	Ferruh Yigit <fery@...ress.com>
Cc:	Dmitry Torokhov <dmitry.torokhov@...il.com>, ttdrivers@...ress.com,
	Javier Martinez Canillas <javier@...hile0.org>,
	Kees Cook <keescook@...omium.org>,
	Greg KH <gregkh@...uxfoundation.org>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] Input: cyttsp - fix memcpy size param

(Cc'ed Kees and Greg)

Hi Dmitry,

On Fri, May 10, 2013 at 04:32:48PM +0300, Ferruh Yigit wrote:
> memcpy param is wrong because of offset in bl_cmd, this may corrupt the
> stack which may cause a crash.
> 
> Tested-by: Ferruh Yigit <fery@...ress.com> on TMA300-DVK
> Signed-off-by: Ferruh Yigit <fery@...ress.com>
> ---
>  drivers/input/touchscreen/cyttsp_core.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/input/touchscreen/cyttsp_core.c b/drivers/input/touchscreen/cyttsp_core.c
> index 8e60437..97ba891 100644
> --- a/drivers/input/touchscreen/cyttsp_core.c
> +++ b/drivers/input/touchscreen/cyttsp_core.c
> @@ -133,7 +133,7 @@ static int cyttsp_exit_bl_mode(struct cyttsp *ts)
>         memcpy(bl_cmd, bl_command, sizeof(bl_command));
>         if (ts->pdata->bl_keys)
>                 memcpy(&bl_cmd[sizeof(bl_command) - CY_NUM_BL_KEYS],
> -                       ts->pdata->bl_keys, sizeof(bl_command));
> +                       ts->pdata->bl_keys, CY_NUM_BL_KEYS);
> 
>         error = ttsp_write_block_data(ts, CY_REG_BASE,
>                                       sizeof(bl_cmd), bl_cmd);
> --
> 1.7.9.5
I was going to send a patch and found that it was just fixed in todays
next-20130617

Anyway, will this overflow fix go for the next -rc?

Thanks in advance Dmitry!

-- 
Djalal Harouni
http://opendz.org
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