[PATCH 3.19 061/101] iio: imu: Use iio_trigger_get for indio_dev->trig assignment

From: Greg Kroah-Hartman
Date: Fri Apr 17 2015 - 10:00:20 EST


3.19-stable review patch. If anyone has any objections, please let me know.

------------------

From: Darshana Padmadas <darshanapadmadas@xxxxxxxxx>

commit 4ce7ca89d6e8eae9e201cd0e972ba323f33e2fb4 upstream.

This patch uses iio_trigger_get to increment the reference
count of trigger device, to avoid incorrect assignment.
Can result in a null pointer dereference during removal if the
trigger has been changed before removal.

This patch refers to a similar situation encountered through the
following discussion:
http://www.spinics.net/lists/linux-iio/msg13669.html

Signed-off-by: Darshana Padmadas <darshanapadmadas@xxxxxxxxx>
Signed-off-by: Jonathan Cameron <jic23@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
drivers/iio/imu/adis_trigger.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/iio/imu/adis_trigger.c
+++ b/drivers/iio/imu/adis_trigger.c
@@ -60,7 +60,7 @@ int adis_probe_trigger(struct adis *adis
iio_trigger_set_drvdata(adis->trig, adis);
ret = iio_trigger_register(adis->trig);

- indio_dev->trig = adis->trig;
+ indio_dev->trig = iio_trigger_get(adis->trig);
if (ret)
goto error_free_irq;



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