[PATCH 6/8] iio: accel: mma9553: check input value for activity period
From: Irina Tirdea
Date: Wed Apr 08 2015 - 10:38:29 EST
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@xxxxxxxxx>
Suggested-by: Hartmut Knaack <knaack.h@xxxxxx>
---
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,
--
1.9.1
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