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 4.4-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-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 4cd140bda6494543f1c1b0ccceceaa44b676eef6 Mon Sep 17 00:00:00 2001
From: Stefan Windfeldt-Prytz <stefan.windfeldt@xxxxxxxx>
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@xxxxxxxx>
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@xxxxxxxxxxxxxxx
Signed-off-by: Stefan Windfeldt-Prytz <stefan.windfeldt@xxxxxxxx>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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@xxxxxxxx are
queue-4.4/iio-buffer-check-if-a-buffer-has-been-set-up-when-poll-is-called.patch