linux-kernel - [PATCH 5.15 200/201] drm/amdgpu: Off by one in dm_dmub_outbox1_low

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Message-Id: <20220727161036.086600544@linuxfoundation.org>
Date:   Wed, 27 Jul 2022 18:11:44 +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>
Subject: [PATCH 5.15 200/201] drm/amdgpu: Off by one in dm_dmub_outbox1_low_irq()

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

commit a35faec3db0e13aac8ea720bc1a3503081dd5a3d upstream.

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: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -757,7 +757,7 @@ static void dm_dmub_outbox1_low_irq(void
 		if (irq_params->irq_src == DC_IRQ_SOURCE_DMCUB_OUTBOX) {
 			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 larger than the array size %ld !", notify.type,
 					ARRAY_SIZE(dm->dmub_thread_offload));
 					continue;