[PATCH AUTOSEL 6.11 131/244] drm/amd/display: Check null pointers before using them

Sasha Levin
2024-09-25T11:43:15Z

From: Alex Hung <alex.hung@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@amd.com>
Signed-off-by: Jerry Zuo <jerry.zuo@amd.com>
Signed-off-by: Alex Hung <alex.hung@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@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 1e069fa5211ee..264e67634dcdc 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -7233,6 +7233,9 @@ 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,
@@ -9340,7 +9343,7 @@ 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);
@@ -9744,9 +9747,10 @@ 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