drm: Reject modes with more than 1 stereo flags set
authorDamien Lespiau <damien.lespiau@intel.com>
Wed, 25 Sep 2013 15:45:25 +0000 (16:45 +0100)
committerDaniel Vetter <daniel.vetter@ffwll.ch>
Tue, 1 Oct 2013 05:45:29 +0000 (07:45 +0200)
When setting a stereo 3D mode, there can be only one bit set describing
the layout of the frambuffer(s). So reject invalid modes early.

Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
Acked-by: Dave Airlie <airlied@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
drivers/gpu/drm/drm_crtc.c

index 454ac8a..090415f 100644 (file)
@@ -1319,6 +1319,10 @@ static int drm_crtc_convert_umode(struct drm_display_mode *out,
        if (in->clock > INT_MAX || in->vrefresh > INT_MAX)
                return -ERANGE;
 
+       /* At most, 1 set bit describing the 3D layout of the mode */
+       if (hweight32(in->flags & DRM_MODE_FLAG_3D_MASK) > 1)
+               return -EINVAL;
+
        out->clock = in->clock;
        out->hdisplay = in->hdisplay;
        out->hsync_start = in->hsync_start;