4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Stefan Windfeldt-Prytz stefan.windfeldt@axis.com
commit 4cd140bda6494543f1c1b0ccceceaa44b676eef6 upstream.
If no iio buffer has been set up and poll is called return 0. Without this check there will be a null pointer dereference when calling poll on a iio driver without an iio buffer.
Cc: stable@vger.kernel.org Signed-off-by: Stefan Windfeldt-Prytz stefan.windfeldt@axis.com Signed-off-by: Jonathan Cameron Jonathan.Cameron@huawei.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/iio/industrialio-buffer.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/iio/industrialio-buffer.c +++ b/drivers/iio/industrialio-buffer.c @@ -174,7 +174,7 @@ unsigned int iio_buffer_poll(struct file struct iio_dev *indio_dev = filp->private_data; struct iio_buffer *rb = indio_dev->buffer;
- if (!indio_dev->info) + if (!indio_dev->info || rb == NULL) return 0;
poll_wait(filp, &rb->pollq, wait);