Patch "iio: buffer: check if a buffer has been set up when poll is called" has been added to the 4.15-stable tree

This is a note to let you know that I've just added the patch titled

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

to the 4.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
iio-buffer-check-if-a-buffer-has-been-set-up-when-poll-is-called.patch
and it can be found in the queue-4.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Stefan Windfeldt-Prytz <[email protected]>
Date: Thu, 15 Feb 2018 15:02:53 +0100
Subject: iio: buffer: check if a buffer has been set up when poll is called

From: Stefan Windfeldt-Prytz <[email protected]>

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.

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

@@ -175,7 +175,7 @@ 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);

Patches currently in stable-queue which might be from [email protected] are

queue-4.15/iio-buffer-check-if-a-buffer-has-been-set-up-when-poll-is-called.patch