4.14-stable review patch. If anyone has any objections, please let me know. ------------------ From: Gerd Hoffmann <kraxel@xxxxxxxxxx> commit 9f591ae60e1be026901398ef99eede91237aa3a1 upstream. On unknown/unhandled ioctls the driver should return an error, so userspace knows it tried to use something unsupported. Cc: stable@xxxxxxxxxxxxxxx Signed-off-by: Gerd Hoffmann <kraxel@xxxxxxxxxx> Reviewed-by: Alex Williamson <alex.williamson@xxxxxxxxxx> Signed-off-by: Zhenyu Wang <zhenyuw@xxxxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/gpu/drm/i915/gvt/kvmgt.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/gpu/drm/i915/gvt/kvmgt.c +++ b/drivers/gpu/drm/i915/gvt/kvmgt.c @@ -1153,7 +1153,7 @@ static long intel_vgpu_ioctl(struct mdev return 0; } - return 0; + return -ENOTTY; } static ssize_t