linux

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Wentao Liang c3e9826a22 drm/amd/display: Add null pointer check for get_first_active_display()

The function mod_hdcp_hdcp1_enable_encryption() calls the function
get_first_active_display(), but does not check its return value.
The return value is a null pointer if the display list is empty.
This will lead to a null pointer dereference in
mod_hdcp_hdcp2_enable_encryption().

Add a null pointer check for get_first_active_display() and return
MOD_HDCP_STATUS_DISPLAY_NOT_FOUND if the function return null.

Fixes: 2deade5ede ("drm/amd/display: Remove hdcp display state with mst fix")
Signed-off-by: Wentao Liang <vulab@iscas.ac.cn>
Reviewed-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org # v5.8

2025-05-29 10:57:13 -04:00

hdcp1_execution.c

drm/amd/display: Revert "Check HDCP returned status"

2024-07-23 17:07:10 -04:00

hdcp1_transition.c

drm/amd/display: add authentication_complete in hdcp output

2021-08-09 15:43:33 -04:00

hdcp2_execution.c

drm/amd/display: HDCP Locality check using DMUB Fused IO

2025-04-07 18:01:07 -04:00

hdcp2_transition.c

drm/amd/display: HDCP Locality check using DMUB Fused IO