From: Irina Tirdea Date: Mon, 13 Apr 2015 15:40:49 +0000 (+0300) Subject: iio: accel: mma9553: check input value for activity period X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=1d93353da536d3403ac291dc96070f434f6cf285;p=linux-beck.git iio: accel: mma9553: check input value for activity period 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 successfully written to device. Signed-off-by: Irina Tirdea Reported-by: Hartmut Knaack Signed-off-by: Jonathan Cameron --- diff --git a/drivers/iio/accel/mma9553.c b/drivers/iio/accel/mma9553.c index 1a256055a6f7..365a109aaaef 100644 --- a/drivers/iio/accel/mma9553.c +++ b/drivers/iio/accel/mma9553.c @@ -54,6 +54,7 @@ #define MMA9553_MASK_CONF_STEPCOALESCE GENMASK(7, 0) #define MMA9553_REG_CONF_ACTTHD 0x0E +#define MMA9553_MAX_ACTTHD GENMASK(15, 0) /* Pedometer status registers (R-only) */ #define MMA9553_REG_STATUS 0x00 @@ -869,6 +870,9 @@ 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,