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drm/amd/display: Avoid a NULL pointer dereference

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[WHY]
Although unlikely drm_atomic_get_new_connector_state() or
drm_atomic_get_old_connector_state() can return NULL.

[HOW]
Check returns before dereference.

Cc: Mario Limonciello <mario.limonciello@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Alex Hung <alex.hung@amd.com>
Tested-by: Dan Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 1e5e8d672fec9f2ab352be121be971877bff2af9)
Cc: stable@vger.kernel.org
This commit is contained in:
Mario Limonciello 2025-07-24 15:00:43 -05:00 committed by Alex Deucher
parent 79e25cd06e
commit 07b93a5704
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
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@ -7792,6 +7792,9 @@ amdgpu_dm_connector_atomic_check(struct drm_connector *conn,
struct amdgpu_dm_connector *aconn = to_amdgpu_dm_connector(conn);
int ret;
if (WARN_ON(unlikely(!old_con_state || !new_con_state)))
return -EINVAL;
trace_amdgpu_dm_connector_atomic_check(new_con_state);
if (conn->connector_type == DRM_MODE_CONNECTOR_DisplayPort) {