From: Ville Syrjälä ville.syrjala@linux.intel.com
Help drivers a little by guaranteeing that crtc_x+crtc_w and crtc_y+crtc_h don't overflow.
Signed-off-by: Ville Syrjälä ville.syrjala@linux.intel.com --- drivers/gpu/drm/drm_crtc.c | 12 ++++++++++++ 1 files changed, 12 insertions(+), 0 deletions(-)
diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c index 1242e12..b98e491 100644 --- a/drivers/gpu/drm/drm_crtc.c +++ b/drivers/gpu/drm/drm_crtc.c @@ -1732,6 +1732,18 @@ int drm_mode_setplane(struct drm_device *dev, void *data, goto out; }
+ /* Give drivers some help against integer overflows */ + if (plane_req->crtc_w > INT_MAX || + plane_req->crtc_x > INT_MAX - (int32_t) plane_req->crtc_w || + plane_req->crtc_h > INT_MAX || + plane_req->crtc_y > INT_MAX - (int32_t) plane_req->crtc_h) { + DRM_DEBUG_KMS("Invalid CRTC coordinates %ux%u+%d+%d\n", + plane_req->crtc_w, plane_req->crtc_h, + plane_req->crtc_x, plane_req->crtc_y); + ret = -ERANGE; + goto out; + } + ret = plane->funcs->update_plane(plane, crtc, fb, plane_req->crtc_x, plane_req->crtc_y, plane_req->crtc_w, plane_req->crtc_h,