linux-kernel - Re: [PATCH 03/20] Input: atmel_mxt_ts - verify object size in mxt_write

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Date:	Wed, 14 Mar 2012 10:33:23 +0900
From:	Joonyoung Shim <jy0922.shim@...sung.com>
To:	Daniel Kurtz <djkurtz@...omium.org>
Cc:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Iiro Valkonen <iiro.valkonen@...el.com>,
	Henrik Rydberg <rydberg@...omail.se>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	Benson Leung <bleung@...omium.org>,
	Yufeng Shen <miletus@...omium.org>
Subject: Re: [PATCH 03/20] Input: atmel_mxt_ts - verify object size in
 mxt_write_object

On 03/13/2012 09:04 PM, Daniel Kurtz wrote:
> Don't allow writing past the length of an object.
>
> Signed-off-by: Daniel Kurtz<djkurtz@...omium.org>
> ---
>   drivers/input/touchscreen/atmel_mxt_ts.c |    2 +-
>   1 files changed, 1 insertions(+), 1 deletions(-)
>
> diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c
> index 0d4d492..e18c698 100644
> --- a/drivers/input/touchscreen/atmel_mxt_ts.c
> +++ b/drivers/input/touchscreen/atmel_mxt_ts.c
> @@ -506,7 +506,7 @@ static int mxt_write_object(struct mxt_data *data,
>   	u16 reg;
>
>   	object = mxt_get_object(data, type);
> -	if (!object)
> +	if (!object || offset>= object->size)

The object->size is actual object size - 1.

+	if (!object || offset>  object->size)


>   		return -EINVAL;
>
>   	reg = object->start_address;

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