From: Leo Liu <leo.liu@amd.com>
Date: Mon, 28 Apr 2014 13:40:22 +0000 (-0400)
Subject: drm/radeon: check buffer relocation offset
X-Git-Tag: firefly_0821_release~3679^2~2220
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=18cb317078ba64706cda094a7b72da5faa7968e6;p=firefly-linux-kernel-4.4.55.git

drm/radeon: check buffer relocation offset

commit 695daf1a8e731a4b5b89de89a61f32a4d7ad7094 upstream.

Signed-off-by: Leo Liu <leo.liu@amd.com>
Signed-off-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/gpu/drm/radeon/radeon_uvd.c b/drivers/gpu/drm/radeon/radeon_uvd.c
index 21d2d5280fc1..5715429279fb 100644
--- a/drivers/gpu/drm/radeon/radeon_uvd.c
+++ b/drivers/gpu/drm/radeon/radeon_uvd.c
@@ -449,6 +449,10 @@ static int radeon_uvd_cs_reloc(struct radeon_cs_parser *p,
 	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 to small (%d / %d)!\n",
 				  (unsigned)(end - start), buf_sizes[cmd]);