[PATCH 6.6 458/676] drm/amd/display: Check phantom_stream before it is used

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6.6-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Alex Hung <alex.hung@xxxxxxx>

commit 3718a619a8c0a53152e76bb6769b6c414e1e83f4 upstream.

dcn32_enable_phantom_stream can return null, so returned value
must be checked before used.

This fixes 1 NULL_RETURNS issue reported by Coverity.

Reviewed-by: Rodrigo Siqueira <rodrigo.siqueira@xxxxxxx>
Signed-off-by: Jerry Zuo <jerry.zuo@xxxxxxx>
Signed-off-by: Alex Hung <alex.hung@xxxxxxx>
Tested-by: Daniel Wheeler <daniel.wheeler@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
[Xiangyu: BP to fix CVE: CVE-2024-49897, modified the source path]
Signed-off-by: Xiangyu Chen <xiangyu.chen@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource.c
@@ -1786,6 +1786,9 @@ void dcn32_add_phantom_pipes(struct dc *
 	// be a valid candidate for SubVP (i.e. has a plane, stream, doesn't
 	// already have phantom pipe assigned, etc.) by previous checks.
 	phantom_stream = dcn32_enable_phantom_stream(dc, context, pipes, pipe_cnt, index);
+	if (!phantom_stream)
+		return;
+
 	dcn32_enable_phantom_plane(dc, context, phantom_stream, index);
 
 	for (i = 0; i < dc->res_pool->pipe_count; i++) {






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