drm: Reject page_flip for !DRIVER_MODESET

commit 6f00975c619064a18c23fd3aced325ae165a73b9 upstream.

Somehow this one slipped through, which means drivers without modeset
support can be oopsed (since those also don't call
drm_mode_config_init, which means the crtc lookup will chase an
uninitalized idr).

Reported-by: Alexander Potapenko <glider@google.com>
Cc: Alexander Potapenko <glider@google.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index 20110b4..4ca454b 100644 (file)
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -2675,6 +2675,9 @@ int drm_mode_page_flip_ioctl(struct drm_device *dev,
        unsigned long flags;
        int ret = -EINVAL;
 
+       if (!drm_core_check_feature(dev, DRIVER_MODESET))
+               return -EINVAL;
+
        if (page_flip->flags & ~DRM_MODE_PAGE_FLIP_FLAGS ||
            page_flip->reserved != 0)
                return -EINVAL;