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drm/amd/display: Fix slab-use-after-free on hdcp_work

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[Why]
A slab-use-after-free is reported when HDCP is destroyed but the
property_validate_dwork queue is still running.

[How]
Cancel the delayed work when destroying workqueue.

Closes: https://gitlab.freedesktop.org/drm/amd/-/issues/4006
Fixes: da3fd7ac0b ("drm/amd/display: Update CP property based on HW query")
Cc: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Tom Chung <chiahsuan.chung@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 725a04ba5a)
Cc: stable@vger.kernel.org
This commit is contained in:
Mario Limonciello 2025-02-28 13:18:14 -06:00 committed by Alex Deucher
parent 79e31396fd
commit e65e7bea22
1 changed files with 1 additions and 0 deletions
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drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_hdcp.c
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@ -455,6 +455,7 @@ void hdcp_destroy(struct kobject *kobj, struct hdcp_workqueue *hdcp_work)
for (i = 0; i < hdcp_work->max_link; i++) {
cancel_delayed_work_sync(&hdcp_work[i].callback_dwork);
cancel_delayed_work_sync(&hdcp_work[i].watchdog_timer_dwork);
cancel_delayed_work_sync(&hdcp_work[i].property_validate_dwork);
}
sysfs_remove_bin_file(kobj, &hdcp_work[0].attr);