commit 695daf1a8e731a4b5b89de89a61f32a4d7ad7094
author Leo Liu <leo.liu@amd.com> Mon Apr 28 09:40:22 2014 -0400
committer Christian König <christian.koenig@amd.com> Thu May 01 12:28:06 2014 +0200
tree 53ae27387f131279f27af15c837aa4b6896e6e1a
parent f5d636d2a74b755879feec35e14a259de52ccc07

drm/radeon: check buffer relocation offset

Signed-off-by: Leo Liu <leo.liu@amd.com>
Signed-off-by: Christian König <christian.koenig@amd.com>
Cc: stable@vger.kernel.org

drivers/gpu/drm/radeon/radeon_uvd.c

diff --git a/drivers/gpu/drm/radeon/radeon_uvd.c b/drivers/gpu/drm/radeon/radeon_uvd.c
index 5748bda..0f96c47 100644
--- a/drivers/gpu/drm/radeon/radeon_uvd.c
+++ b/drivers/gpu/drm/radeon/radeon_uvd.c
@@ -465,6 +465,10 @@
 	cmd = radeon_get_ib_value(p, p->idx) >> 1;
 
 	if (cmd < 0x4) {
+		if (end <= start) {
+			DRM_ERROR("invalid reloc offset %X!\n", offset);
+			return -EINVAL;
+		}
 		if ((end - start) < buf_sizes[cmd]) {
 			DRM_ERROR("buffer (%d) to small (%d / %d)!\n", cmd,
 				  (unsigned)(end - start), buf_sizes[cmd]);