iio: buffer: check if a buffer has been set up when poll is called

[ Upstream commit 4cd140b ] 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: [email protected] Signed-off-by: Stefan Windfeldt-Prytz <[email protected]> Signed-off-by: Jonathan Cameron <[email protected]> Signed-off-by: Sasha Levin <[email protected]>
Noltari · Mar 4, 2018 · 4aac881 · 4aac881
1 parent 953eb3c
commit 4aac881
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/drivers/iio/industrialio-buffer.c b/drivers/iio/industrialio-buffer.c
@@ -150,7 +150,7 @@ unsigned int iio_buffer_poll(struct file *filp,
 	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);