linux-kernel - [PATCH 5.17 081/298] drm/amdgpu: Off by one in dm_dmub_outbox1_low

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Message-Id: <20220613094927.403634386@linuxfoundation.org>
Date:   Mon, 13 Jun 2022 12:09:35 +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, Harry Wentland <harry.wentland@....com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Alex Deucher <alexander.deucher@....com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.17 081/298] drm/amdgpu: Off by one in dm_dmub_outbox1_low_irq()

From: Dan Carpenter <dan.carpenter@...cle.com>

[ Upstream commit a35faec3db0e13aac8ea720bc1a3503081dd5a3d ]

The > ARRAY_SIZE() should be >= ARRAY_SIZE() to prevent an out of bounds
access.

Fixes: e27c41d5b068 ("drm/amd/display: Support for DMUB HPD interrupt handling")
Reviewed-by: Harry Wentland <harry.wentland@....com>
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index 24db2297857b..edb5e72aeb66 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -767,7 +767,7 @@ static void dm_dmub_outbox1_low_irq(void *interrupt_params)
 
 		do {
 			dc_stat_get_dmub_notification(adev->dm.dc, &notify);
-			if (notify.type > ARRAY_SIZE(dm->dmub_thread_offload)) {
+			if (notify.type >= ARRAY_SIZE(dm->dmub_thread_offload)) {
 				DRM_ERROR("DM: notify type %d invalid!", notify.type);
 				continue;
 			}
-- 
2.35.1