From: Mikko Perttunen <mperttunen@nvidia.com>
Date: Wed, 20 Jun 2018 13:03:58 +0000 (+0300)
Subject: drm/tegra: Fix comparison operator for buffer size
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=f2cbde943d9797f49ff484408e1edb4fd9bccaae;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

drm/tegra: Fix comparison operator for buffer size

[ Upstream commit 5265f0338bc0feec6c0d544dfe005dec1a93cb93 ]

Here we are checking for the buffer length, not an offset for writing
to, so using > is correct. The current code incorrectly rejects a
command buffer ending at the memory buffer's end.

Signed-off-by: Mikko Perttunen <mperttunen@nvidia.com>
Reviewed-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/gpu/drm/tegra/drm.c b/drivers/gpu/drm/tegra/drm.c
index 0598b4c18c25..75b1c8c03ce9 100644
--- a/drivers/gpu/drm/tegra/drm.c
+++ b/drivers/gpu/drm/tegra/drm.c
@@ -470,7 +470,7 @@ int tegra_drm_submit(struct tegra_drm_context *context,
 		 * unaligned offset is malformed and cause commands stream
 		 * corruption on the buffer address relocation.
 		 */
-		if (offset & 3 || offset >= obj->gem.size) {
+		if (offset & 3 || offset > obj->gem.size) {
 			err = -EINVAL;
 			goto fail;
 		}