linux-kernel - [PATCH][next] drm/kmb: fix array out-of-bounds writes to kmb->plane

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Date:   Fri, 13 Nov 2020 12:01:21 +0000
From:   Colin King <colin.king@...onical.com>
To:     Anitha Chrisanthus <anitha.chrisanthus@...el.com>,
        Edmund Dea <edmund.j.dea@...el.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Sam Ravnborg <sam@...nborg.org>,
        dri-devel@...ts.freedesktop.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH][next] drm/kmb: fix array out-of-bounds writes to kmb->plane_status[]

From: Colin Ian King <colin.king@...onical.com>

Writes to elements in the kmb->plane_status array in function
kmb_plane_atomic_disable are overrunning the array when plane_id is
more than 1 because currently the array is KMB_MAX_PLANES elements
in size and this is currently #defined as 1.  Fix this by defining
KMB_MAX_PLANES to 4.

Addresses-Coverity: ("Out-of-bounds write")
Fixes: 7f7b96a8a0a1 ("drm/kmb: Add support for KeemBay Display")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 drivers/gpu/drm/kmb/kmb_plane.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/kmb/kmb_plane.h b/drivers/gpu/drm/kmb/kmb_plane.h
index 486490f7a3ec..6f43a7ae3de6 100644
--- a/drivers/gpu/drm/kmb/kmb_plane.h
+++ b/drivers/gpu/drm/kmb/kmb_plane.h
@@ -43,7 +43,7 @@ enum layer_id {
 	/* KMB_MAX_PLANES */
 };
 
-#define KMB_MAX_PLANES 1
+#define KMB_MAX_PLANES 4
 
 enum sub_plane_id {
 	Y_PLANE,
-- 
2.28.0