From: Hans Verkuil hverkuil-cisco@xs4all.nl
commit 4e768c8e34e639cff66a0f175bc4aebf472e4305 upstream.
The v4l2_compat_get_array_args() function can leave uninitialized memory in the buffer it is passed. So zero it before copying array elements from userspace into the buffer.
Signed-off-by: Hans Verkuil hverkuil-cisco@xs4all.nl Reported-by: syzbot+ff18193ff05f3f87f226@syzkaller.appspotmail.com Reviewed-by: Laurent Pinchart laurent.pinchart@ideasonboard.com Signed-off-by: Mauro Carvalho Chehab mchehab@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/media/v4l2-core/v4l2-compat-ioctl32.c | 2 ++ 1 file changed, 2 insertions(+)
--- a/drivers/media/v4l2-core/v4l2-compat-ioctl32.c +++ b/drivers/media/v4l2-core/v4l2-compat-ioctl32.c @@ -1040,6 +1040,8 @@ int v4l2_compat_get_array_args(struct fi { int err = 0;
+ memset(mbuf, 0, array_size); + switch (cmd) { case VIDIOC_G_FMT32: case VIDIOC_S_FMT32: