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Wentao Liang 4ce9f2dc9f drm/amd/display: Add null pointer check for get_first_active_display() ... commit c3e9826a22 upstream. 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 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		History 2025-07-06 11:01:45 +02:00
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color	drm/amd/display: Fix compiler warnings on high compiler warning levels	2024-04-09 22:05:04 -04:00
freesync	drm/amd/display: Limit VTotal range to max hw cap minus fp	2024-12-14 20:03:28 +01:00
hdcp	drm/amd/display: Add null pointer check for get_first_active_display()	2025-07-06 11:01:45 +02:00
inc	drm/amd/display: revert Exit idle optimizations before HDCP execution	2024-03-20 13:36:29 -04:00
info_packet	drm/amd/display: Fix BT2020 YCbCr limited/full range input	2025-05-29 11:02:44 +02:00
power	drm/amd/display: Disable PSR-SU on Parade 08-01 TCON too	2024-10-22 18:13:03 -04:00
vmid	drm/amd: Fix spelling typo in comments	2022-06-03 16:43:36 -04:00