| From | Greg Kroah-Hartman <> | Subject | [PATCH 5.4 73/88] iio: mma8452: Fix trigger reference couting | Date | Mon, 13 Dec 2021 10:30:43 +0100 |
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From: Lars-Peter Clausen <lars@metafoo.de>
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> --- drivers/iio/accel/mma8452.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/iio/accel/mma8452.c +++ b/drivers/iio/accel/mma8452.c @@ -1473,7 +1473,7 @@ static int mma8452_trigger_setup(struct if (ret) return ret; - indio_dev->trig = trig; + indio_dev->trig = iio_trigger_get(trig); return 0; }
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