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

media: v4l2-compat-ioctl32.c: don't copy back the result for certain errors

to the 4.15-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: media-v4l2-compat-ioctl32.c-don-t-copy-back-the-result-for-certain-errors.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 stable@vger.kernel.org know about it.

From d83a8243aaefe62ace433e4384a4f077bed86acb Mon Sep 17 00:00:00 2001

From: Hans Verkuil hans.verkuil@cisco.com Date: Fri, 26 Jan 2018 03:24:53 -0500 Subject: media: v4l2-compat-ioctl32.c: don't copy back the result for certain errors

From: Hans Verkuil hans.verkuil@cisco.com

commit d83a8243aaefe62ace433e4384a4f077bed86acb upstream.

Some ioctls need to copy back the result even if the ioctl returned an error. However, don't do this for the error code -ENOTTY. It makes no sense in that cases.

Signed-off-by: Hans Verkuil hans.verkuil@cisco.com Acked-by: Sakari Ailus sakari.ailus@linux.intel.com Signed-off-by: Mauro Carvalho Chehab mchehab@s-opensource.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org

--- drivers/media/v4l2-core/v4l2-compat-ioctl32.c | 3 +++ 1 file changed, 3 insertions(+)

--- a/drivers/media/v4l2-core/v4l2-compat-ioctl32.c +++ b/drivers/media/v4l2-core/v4l2-compat-ioctl32.c @@ -968,6 +968,9 @@ static long do_video_ioctl(struct file * set_fs(old_fs); }

+ if (err == -ENOTTY) + return err; + /* Special case: even after an error we need to put the results back for these ioctls since the error_idx will contain information on which control failed. */

Patches currently in stable-queue which might be from hans.verkuil@cisco.com are

queue-4.15/media-hdpvr-fix-an-error-handling-path-in-hdpvr_probe.patch queue-4.15/media-v4l2-compat-ioctl32.c-copy-m.userptr-in-put_v4l2_plane32.patch queue-4.15/media-v4l2-compat-ioctl32.c-avoid-sizeof-type.patch queue-4.15/media-v4l2-compat-ioctl32.c-drop-pr_info-for-unknown-buffer-type.patch queue-4.15/media-v4l2-compat-ioctl32.c-add-missing-vidioc_prepare_buf.patch queue-4.15/media-v4l2-compat-ioctl32.c-refactor-compat-ioctl32-logic.patch queue-4.15/media-v4l2-compat-ioctl32.c-fix-ctrl_is_pointer.patch queue-4.15/media-v4l2-compat-ioctl32.c-move-helper-functions-to-__get-put_v4l2_format32.patch queue-4.15/media-v4l2-compat-ioctl32.c-don-t-copy-back-the-result-for-certain-errors.patch queue-4.15/media-v4l2-compat-ioctl32.c-make-ctrl_is_pointer-work-for-subdevs.patch queue-4.15/media-v4l2-compat-ioctl32.c-fix-the-indentation.patch queue-4.15/media-v4l2-ioctl.c-don-t-copy-back-the-result-for-enotty.patch queue-4.15/media-v4l2-ioctl.c-use-check_fmt-for-enum-g-s-try_fmt.patch queue-4.15/media-v4l2-compat-ioctl32.c-copy-clip-list-in-put_v4l2_window32.patch