[PATCH 6.18 087/212] drm/amdgpu/mmhub4.1.0: add bounds checking for cid

Greg Kroah-Hartman
2026-03-23T14:07:30Z

From: Alex Deucher <alexander.deucher@amd.com>

commit 3cdd405831d8cc50a5eae086403402697bb98a4a upstream.

The value should never exceed the array size as those
are the only values the hardware is expected to return,
but add checks anyway.

Reviewed-by: Benjamin Cheng <benjamin.cheng@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 04f063d85090f5dd0c671010ce88ee49d9dcc8ed)
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/gpu/drm/amd/amdgpu/mmhub_v4_1_0.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/amd/amdgpu/mmhub_v4_1_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/mmhub_v4_1_0.c
@@ -102,7 +102,8 @@ mmhub_v4_1_0_print_l2_protection_fault_s
status);
switch (amdgpu_ip_version(adev, MMHUB_HWIP, 0)) {
case IP_VERSION(4, 1, 0):
- mmhub_cid = mmhub_client_ids_v4_1_0[cid][rw];
+ mmhub_cid = cid < ARRAY_SIZE(mmhub_client_ids_v4_1_0) ?
+ mmhub_client_ids_v4_1_0[cid][rw] : NULL;
break;
default:
mmhub_cid = NULL;