From: Wladimir J. van der Laan <laanwj@gmail.com>
Date: Tue, 25 Jul 2017 12:33:36 +0000 (+0200)
Subject: drm/etnaviv: Fix off-by-one error in reloc checking
X-Git-Tag: v4.12.8~44
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4eedc8a7f03b15a9daad69b4d54e43f79fa0e16e;p=thirdparty%2Fkernel%2Fstable.git

drm/etnaviv: Fix off-by-one error in reloc checking

commit d6f756e09f01ea7a0efbbcef269a1e384a35d824 upstream.

A relocation pointing to the last four bytes of a buffer can
legitimately happen in the case of small vertex buffers.

Signed-off-by: Wladimir J. van der Laan <laanwj@gmail.com>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Reviewed-by: Christian Gmeiner <christian.gmeiner@gmail.com>
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c b/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c
index 1013765274da4..0ceed22187df7 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c
@@ -270,8 +270,8 @@ static int submit_reloc(struct etnaviv_gem_submit *submit, void *stream,
 		if (ret)
 			return ret;
 
-		if (r->reloc_offset >= bo->obj->base.size - sizeof(*ptr)) {
-			DRM_ERROR("relocation %u outside object", i);
+		if (r->reloc_offset > bo->obj->base.size - sizeof(*ptr)) {
+			DRM_ERROR("relocation %u outside object\n", i);
 			return -EINVAL;
 		}