[PATCH 4/7] drm: plane: Check source coordinates

[ville.syrjala at linux.intel.com]

From: Ville Syrjälä <ville.syrjala at linux.intel.com>

Make sure the source coordinates stay within the buffer.

Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/drm_crtc.c |   23 +++++++++++++++++++++++
 1 files changed, 23 insertions(+), 0 deletions(-)

diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index 70f5747..098cc50 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -1654,6 +1654,7 @@ int drm_mode_setplane(struct drm_device *dev, void *data,
 	struct drm_crtc *crtc;
 	struct drm_framebuffer *fb;
 	int ret = 0;
+	unsigned int fb_width, fb_height;
 
 	if (!drm_core_check_feature(dev, DRIVER_MODESET))
 		return -EINVAL;
@@ -1702,6 +1703,28 @@ int drm_mode_setplane(struct drm_device *dev, void *data,
 	}
 	fb = obj_to_fb(obj);
 
+	fb_width = fb->width << 16;
+	fb_height = fb->height << 16;
+
+	/* Make sure source coordinates are inside the fb. */
+	if (plane_req->src_w > fb_width ||
+	    plane_req->src_x > fb_width - plane_req->src_w ||
+	    plane_req->src_h > fb_height ||
+	    plane_req->src_y > fb_height - plane_req->src_h) {
+		DRM_DEBUG_KMS("Invalid source coordinates "
+			      "%01u.%06ux%01u.%06u+%01u.%06u+%01u.%06u\n",
+			      plane_req->src_w >> 16,
+			      ((plane_req->src_w & 0xffff) * 15625) >> 10,
+			      plane_req->src_h >> 16,
+			      ((plane_req->src_h & 0xffff) * 15625) >> 10,
+			      plane_req->src_x >> 16,
+			      ((plane_req->src_x & 0xffff) * 15625) >> 10,
+			      plane_req->src_y >> 16,
+			      ((plane_req->src_y & 0xffff) * 15625) >> 10);
+		ret = -EINVAL;
+		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,
-- 
1.7.3.4