[PATCH AUTOSEL 6.10 114/197] drm/amd/display: Check null pointers before using them

[Sasha Levin]

From: Alex Hung <alex.hung at amd.com>

[ Upstream commit 1ff12bcd7deaeed25efb5120433c6a45dd5504a8 ]

[WHAT & HOW]
These pointers are null checked previously in the same function,
indicating they might be null as reported by Coverity. As a result,
they need to be checked when used again.

This fixes 3 FORWARD_NULL issue reported by Coverity.

Reviewed-by: Rodrigo Siqueira <rodrigo.siqueira at amd.com>
Signed-off-by: Jerry Zuo <jerry.zuo at amd.com>
Signed-off-by: Alex Hung <alex.hung at amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler at amd.com>
Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
Signed-off-by: Sasha Levin <sashal at kernel.org>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index 27e641f176289..3c418428264ca 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -6935,6 +6935,9 @@ create_validate_stream_for_sink(struct amdgpu_dm_connector *aconnector,
 	int requested_bpc = drm_state ? drm_state->max_requested_bpc : 8;
 	enum dc_status dc_result = DC_OK;
 
+	if (!dm_state)
+		return NULL;
+
 	do {
 		stream = create_stream_for_sink(connector, drm_mode,
 						dm_state, old_stream,
@@ -8947,7 +8950,7 @@ static void amdgpu_dm_commit_streams(struct drm_atomic_state *state,
 		if (acrtc)
 			old_crtc_state = drm_atomic_get_old_crtc_state(state, &acrtc->base);
 
-		if (!acrtc->wb_enabled)
+		if (!acrtc || !acrtc->wb_enabled)
 			continue;
 
 		dm_old_crtc_state = to_dm_crtc_state(old_crtc_state);
@@ -9346,9 +9349,10 @@ static void amdgpu_dm_atomic_commit_tail(struct drm_atomic_state *state)
 
 			DRM_INFO("[HDCP_DM] hdcp_update_display enable_encryption = %x\n", enable_encryption);
 
-			hdcp_update_display(
-				adev->dm.hdcp_workqueue, aconnector->dc_link->link_index, aconnector,
-				new_con_state->hdcp_content_type, enable_encryption);
+			if (aconnector->dc_link)
+				hdcp_update_display(
+					adev->dm.hdcp_workqueue, aconnector->dc_link->link_index, aconnector,
+					new_con_state->hdcp_content_type, enable_encryption);
 		}
 	}
 
-- 
2.43.0