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 <irina.tirdea@intel.com>
Reported-by: Hartmut Knaack <knaack.h@gmx.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

diff --git a/drivers/iio/accel/mma9553.c b/drivers/iio/accel/mma9553.c
index 1a25605..365a109 100644 (file)
--- 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,