diff options
| author | Lars-Peter Clausen <lars@metafoo.de> | 2021-10-24 11:26:59 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-12-14 10:18:09 +0100 |
| commit | f5deab10ced368c807866283f8b79144c4823be8 (patch) | |
| tree | e5a6af3c0b15fc51fd47f8ab7d059dbeb306f4a6 /drivers | |
| parent | ed04c87d83ff7cfba44c0c3b57fba1f8ea18d872 (diff) | |
iio: mma8452: Fix trigger reference couting
commit cd0082235783f814241a1c9483fb89e405f4f892 upstream.
The mma8452 driver directly assigns a trigger to the struct iio_dev. The
IIO core when done using this trigger will call `iio_trigger_put()` to drop
the reference count by 1.
Without the matching `iio_trigger_get()` in the driver the reference count
can reach 0 too early, the trigger gets freed while still in use and a
use-after-free occurs.
Fix this by getting a reference to the trigger before assigning it to the
IIO device.
Fixes: ae6d9ce05691 ("iio: mma8452: Add support for interrupt driven triggers.")
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Link: https://lore.kernel.org/r/20211024092700.6844-1-lars@metafoo.de
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/iio/accel/mma8452.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/iio/accel/mma8452.c b/drivers/iio/accel/mma8452.c index 15c254b4745c..1ef75c94987b 100644 --- a/drivers/iio/accel/mma8452.c +++ b/drivers/iio/accel/mma8452.c @@ -1470,7 +1470,7 @@ static int mma8452_trigger_setup(struct iio_dev *indio_dev) if (ret) return ret; - indio_dev->trig = trig; + indio_dev->trig = iio_trigger_get(trig); return 0; } |