iio: tmp006: Check channel info on write

only SAMP_FREQ is writable

Will lead to SAMP_FREQ being written by any attempt to write
to the other exported attributes and hence a rather unexpected
result!

Signed-off-by: Peter Meerwald <pmeerw@pmeerw.net>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/iio/temperature/tmp006.c b/drivers/iio/temperature/tmp006.c
index fcc49f89b946..8f21f32f9739 100644
--- a/drivers/iio/temperature/tmp006.c
+++ b/drivers/iio/temperature/tmp006.c
@@ -132,6 +132,9 @@ static int tmp006_write_raw(struct iio_dev *indio_dev,
         struct tmp006_data *data = iio_priv(indio_dev);
         int i;
 
+        if (mask != IIO_CHAN_INFO_SAMP_FREQ)
+                return -EINVAL;
+
         for (i = 0; i < ARRAY_SIZE(tmp006_freqs); i++)
                 if ((val == tmp006_freqs[i][0]) &&
                     (val2 == tmp006_freqs[i][1])) {