[PATCH 5.15 200/201] drm/amdgpu: Off by one in dm_dmub_outbox1_low_irq()

Greg Kroah-Hartman
2022-07-27T17:25:44Z

From: Dan Carpenter <dan.carpenter@oracle.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@amd.com>
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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;