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Subject: media: v4l2-ioctl.c: don't copy back the result for -ENOTTY Author: Hans Verkuil hans.verkuil@cisco.com 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@cisco.com Acked-by: Sakari Ailus sakari.ailus@linux.intel.com Cc: stable@vger.kernel.org # for v4.15 and up Signed-off-by: Mauro Carvalho Chehab mchehab@s-opensource.com
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);