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Subject: media: v4l2-ioctl.c: don't copy back the result for -ENOTTY
Author: Hans Verkuil <hans.verkuil@xxxxxxxxx>
Date: Tue Jan 30 03:50:01 2018 -0500
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>
drivers/media/v4l2-core/v4l2-ioctl.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
---
diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
index c7f6b65d3ad7..260288ca4f55 100644
--- a/drivers/media/v4l2-core/v4l2-ioctl.c
+++ b/drivers/media/v4l2-core/v4l2-ioctl.c
@@ -2900,8 +2900,11 @@ video_usercopy(struct file *file, unsigned int cmd, unsigned long arg,
/* 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);