[PATCH RESEND] drm/amd/display: Add null check before access structs in dcn32_enable_phantom_plane

[Ma Ke]

In dcn32_enable_phantom_plane, we should better check null pointer before
accessing various structs.

Cc: stable at vger.kernel.org
Fixes: 235c67634230 ("drm/amd/display: add DCN32/321 specific files for Display Core")
Signed-off-by: Ma Ke <make24 at iscas.ac.cn>
---
 drivers/gpu/drm/amd/display/dc/resource/dcn32/dcn32_resource.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/dc/resource/dcn32/dcn32_resource.c b/drivers/gpu/drm/amd/display/dc/resource/dcn32/dcn32_resource.c
index 969658313fd6..1d1b40d22f42 100644
--- a/drivers/gpu/drm/amd/display/dc/resource/dcn32/dcn32_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/resource/dcn32/dcn32_resource.c
@@ -1650,6 +1650,8 @@ static void dcn32_enable_phantom_plane(struct dc *dc,
 			phantom_plane = prev_phantom_plane;
 		else
 			phantom_plane = dc_state_create_phantom_plane(dc, context, curr_pipe->plane_state);
+		if (!phantom_plane)
+			return;
 
 		memcpy(&phantom_plane->address, &curr_pipe->plane_state->address, sizeof(phantom_plane->address));
 		memcpy(&phantom_plane->scaling_quality, &curr_pipe->plane_state->scaling_quality,
-- 
2.25.1