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 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...
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-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.
From 4cd140bda6494543f1c1b0ccceceaa44b676eef6 Mon Sep 17 00:00:00 2001
From: Stefan Windfeldt-Prytz stefan.windfeldt@axis.com 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 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);
Patches currently in stable-queue which might be from stefan.windfeldt@axis.com are
queue-4.9/iio-buffer-check-if-a-buffer-has-been-set-up-when-poll-is-called.patch