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Commit 42ef8789 authored by Ville Syrjälä's avatar Ville Syrjälä Committed by Dave Airlie
Browse files

drm: plane: Check source coordinates 



Make sure the source coordinates stay within the buffer.

Signed-off-by: default avatarVille Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: default avatarDave Airlie <airlied@redhat.com>
parent e5e3b44c

drivers/gpu/drm/drm_crtc.c

+23 −0
Original line number Diff line number Diff line
@@ -1661,6 +1661,7 @@ 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;
@@ -1709,6 +1710,28 @@ 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 "

			      "%u.%06ux%u.%06u+%u.%06u+%u.%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 = -ENOSPC;

		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,