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| author |   Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> | 2012-09-20 01:15:00 +0100 |
|---|---|---|
| committer |   Jonathan Cameron <jic23@kernel.org> | 2012-09-22 10:07:34 +0100 |
| commit | f07b60b7c34b771431f1d00e783f29a3667ff5ee (patch) | |
| tree | bafe8ebf6796ead4414ac0f8530c5c4e43d3e46f /drivers/iio | |
| parent | HID: sensors: remove some unneeded checks (diff) | |
| download | linux-dev-f07b60b7c34b771431f1d00e783f29a3667ff5ee.tar.xz linux-dev-f07b60b7c34b771431f1d00e783f29a3667ff5ee.zip | |
iio: hid-sensors: Prevent crash during hot-unplug
When hid sensor hub is unplugged, there is a crash in
iio_device_unregister_trigger_consumer.
In a typical IIO driver when remove is called, it will unregister and free
trigger and then it will call iio_device_free.
The function iio_trigger_free() will free the allocated memory for trigger.
If this trigger was assigned to iio_dev->trig, then it should be set to NULL.
Othewise when iio_device_free() is called later, it finally calls
iio_device_unregsister_trigger(), which checks for
if (indio_dev->trig)
iio_trigger_put(indio_dev->trig);
If indio_dev->trig is not set to NULL, it calls iio_trigger_put on a bad
pointer causing crash.
This scenerio can happen in any driver, which is storing trigger pointer in
iio_dev structure and following current procedure during remove.
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Diffstat (limited to 'drivers/iio')
| -rw-r--r-- | drivers/iio/common/hid-sensors/hid-sensor-trigger.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/iio/common/hid-sensors/hid-sensor-trigger.c b/drivers/iio/common/hid-sensors/hid-sensor-trigger.c index 12277e8bbd80..d4b790d18efb 100644 --- a/drivers/iio/common/hid-sensors/hid-sensor-trigger.c +++ b/drivers/iio/common/hid-sensors/hid-sensor-trigger.c @@ -56,6 +56,7 @@ void hid_sensor_remove_trigger(struct iio_dev *indio_dev) { iio_trigger_unregister(indio_dev->trig); iio_trigger_free(indio_dev->trig); + indio_dev->trig = NULL; } EXPORT_SYMBOL(hid_sensor_remove_trigger); |