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iio: imu: Use iio_trigger_get for indio_dev->trig assignment 

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@gmail.com>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Darshana Padmadas 2015-03-28 12:07:14 +05:30 committed by Jonathan Cameron
parent f54e9f2be3
commit 4ce7ca89d6
1 changed files with 1 additions and 1 deletions
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2
drivers/iio/imu/adis_trigger.c
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@ -60,7 +60,7 @@ int adis_probe_trigger(struct adis *adis, struct iio_dev *indio_dev)
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;