linux-kernel - Re: [PATCH] Input: synaptics-rmi4: Fix maximum size check for F12 control register 8

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Date:	Tue, 19 Jul 2016 17:00:05 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Andrew Duggan <aduggan@...aptics.com>
Cc:	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	Jiri Kosina <jikos@...nel.org>,
	Benjamin Tissoires <benjamin.tissoires@...hat.com>,
	Vincent Huang <vincent.huang@...synaptics.com>,
	Nick Dyer <nick@...anahar.org>,
	Chris Healy <cphealy@...il.com>,
	Nitin Chaudhary <nitinchaudhary1289@...il.com>,
	stable@...r.kernel.org
Subject: Re: [PATCH] Input: synaptics-rmi4: Fix maximum size check for F12
 control register 8

On Tue, Jul 19, 2016 at 04:43:41PM -0700, Andrew Duggan wrote:
> According to the RMI4 spec the maximum size of F12 control register 8 is
> 15 bytes. The current code incorrectly reports an error if control 8 is
> greater then 14. Making sensors with a control register 8 with 15 bytes
> unusable.
> 
> Signed-off-by: Andrew Duggan <aduggan@...aptics.com>
> Reported-by: Chris Healy <cphealy@...il.com>
> Cc: stable@...r.kernel.org
> ---
>  drivers/input/rmi4/rmi_f12.c | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/input/rmi4/rmi_f12.c b/drivers/input/rmi4/rmi_f12.c
> index c30fd86..9b0d9f7 100644
> --- a/drivers/input/rmi4/rmi_f12.c
> +++ b/drivers/input/rmi4/rmi_f12.c
> @@ -68,7 +68,7 @@ static int rmi_f12_read_sensor_tuning(struct f12_data *f12)
>  	struct rmi_device *rmi_dev = fn->rmi_dev;
>  	int ret;
>  	int offset;
> -	u8 buf[14];
> +	u8 buf[15];
>  	int pitch_x = 0;
>  	int pitch_y = 0;
>  	int clip_x_low = 0;
> @@ -88,8 +88,9 @@ static int rmi_f12_read_sensor_tuning(struct f12_data *f12)
>  
>  	offset = rmi_register_desc_calc_reg_offset(&f12->control_reg_desc, 8);
>  
> -	if (item->reg_size > 14) {
> -		dev_err(&fn->dev, "F12 control8 should be 14 bytes, not: %ld\n",
> +	if (item->reg_size > 15) {

Do you mind if I change this to sizeof(buf)?

> +		dev_err(&fn->dev,
> +			"F12 control8 should be a maximum of 15 bytes, not: %ld\n",
>  			item->reg_size);
>  		return -ENODEV;
>  	}
> -- 
> 2.7.4
> 

-- 
Dmitry