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: v3.15-rc5~10^2~2^2~6
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=695daf1a8e731a4b5b89de89a61f32a4d7ad7094;p=karo-tx-linux.git

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
---

diff --git a/drivers/gpu/drm/radeon/radeon_uvd.c b/drivers/gpu/drm/radeon/radeon_uvd.c
index 5748bdaeacce..0f96c471c6d8 100644
--- a/drivers/gpu/drm/radeon/radeon_uvd.c
+++ b/drivers/gpu/drm/radeon/radeon_uvd.c
@@ -465,6 +465,10 @@ 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 (%d) to small (%d / %d)!\n", cmd,
 				  (unsigned)(end - start), buf_sizes[cmd]);