This is a note to let you know that I've just added the patch titled
media: v4l2-ioctl.c: don't copy back the result for -ENOTTY
to the 3.18-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:
media-v4l2-ioctl.c-don-t-copy-back-the-result-for-enotty.patch
and it can be found in the queue-3.18 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 181a4a2d5a0a7b43cab08a70710d727e7764ccdd Mon Sep 17 00:00:00 2001
From: Hans Verkuil <hans.verkuil@xxxxxxxxx>
Date: Tue, 30 Jan 2018 03:50:01 -0500
Subject: media: v4l2-ioctl.c: don't copy back the result for -ENOTTY
From: Hans Verkuil <hans.verkuil@xxxxxxxxx>
commit 181a4a2d5a0a7b43cab08a70710d727e7764ccdd upstream.
If the ioctl returned -ENOTTY, then don't bother copying
back the result as there is no point.
Signed-off-by: Hans Verkuil <hans.verkuil@xxxxxxxxx>
Acked-by: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> # for v4.15 and up
Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/media/v4l2-core/v4l2-ioctl.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
--- a/drivers/media/v4l2-core/v4l2-ioctl.c
+++ b/drivers/media/v4l2-core/v4l2-ioctl.c
@@ -2539,8 +2539,11 @@ video_usercopy(struct file *file, unsign
/* Handles IOCTL */
err = func(file, cmd, parg);
- if (err == -ENOIOCTLCMD)
+ if (err == -ENOTTY || err == -ENOIOCTLCMD) {
err = -ENOTTY;
+ goto out;
+ }
+
if (err == 0) {
if (cmd == VIDIOC_DQBUF)
trace_v4l2_dqbuf(video_devdata(file)->minor, parg);
Patches currently in stable-queue which might be from hans.verkuil@xxxxxxxxx are
queue-3.18/vb2-v4l2_buf_flag_done-is-set-after-dqbuf.patch
queue-3.18/media-v4l2-ioctl.c-don-t-copy-back-the-result-for-enotty.patch