linux-kernel - [PATCH 4.14 156/217] drm/tegra: Fix comparison operator for buffer size

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Date:   Thu, 23 Aug 2018 09:54:29 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Mikko Perttunen <mperttunen@...dia.com>,
        Dmitry Osipenko <digetx@...il.com>,
        Thierry Reding <treding@...dia.com>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.14 156/217] drm/tegra: Fix comparison operator for buffer size

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Mikko Perttunen <mperttunen@...dia.com>

[ 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@...dia.com>
Reviewed-by: Dmitry Osipenko <digetx@...il.com>
Signed-off-by: Thierry Reding <treding@...dia.com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/gpu/drm/tegra/drm.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- 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_co
 		 * 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;
 		}