linux-kernel - Re: [PATCH 6/8] iio: accel: mma9553: check input value for activity period

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Date:	Thu, 09 Apr 2015 12:46:04 +0100
From:	Jonathan Cameron <jic23@...nel.org>
To:	Irina Tirdea <irina.tirdea@...el.com>, linux-iio@...r.kernel.org,
	Hartmut Knaack <knaack.h@....de>
CC:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 6/8] iio: accel: mma9553: check input value for activity
 period

On 08/04/15 15:37, Irina Tirdea wrote:
> When setting the activity period, the value introduced by
> the user in sysfs is not checked for validity.
> 
> Add a boundary check so that only allowed values are
> reported as suuccesfully written to device.
> 
> Signed-off-by: Irina Tirdea <irina.tirdea@...el.com>
> Suggested-by: Hartmut Knaack <knaack.h@....de>
Good point.  This one counts as a fix so put it early in the
reordered series.
> ---
>  drivers/iio/accel/mma9553.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/iio/accel/mma9553.c b/drivers/iio/accel/mma9553.c
> index 57868fb..96e4708 100644
> --- a/drivers/iio/accel/mma9553.c
> +++ b/drivers/iio/accel/mma9553.c
> @@ -839,6 +839,9 @@ static int mma9553_write_event_value(struct iio_dev *indio_dev,
>  	case IIO_EV_INFO_PERIOD:
>  		switch (chan->type) {
>  		case IIO_ACTIVITY:
> +			if (val < 0 || val > MMA9553_ACTIVITY_THD_TO_SEC(
> +			    MMA9553_MAX_ACTTHD))
> +				return -EINVAL;
>  			mutex_lock(&data->mutex);
>  			ret = mma9553_set_config(data, MMA9553_REG_CONF_ACTTHD,
>  						 &data->conf.actthd,
> 

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