[PATCH -next] drm/amd/display: check top_pipe_to_program pointer

[Yang Li]

Clang static analysis reports this error

drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc.c:2870:7: warning:
Dereference of null pointer [clang-analyzer-core.NullDereference]
                if
(top_pipe_to_program->stream_res.tg->funcs->lock_doublebuffer_enable) {
                    ^

top_pipe_to_program being NULL is caught as an error
But then it is used to report the error.

So add a check before using it.

Reported-by: Abaci Robot <ab...@linux.alibaba.com>
Signed-off-by: Yang Li <yang....@linux.alibaba.com>
---
 drivers/gpu/drm/amd/display/dc/core/dc.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc.c 
b/drivers/gpu/drm/amd/display/dc/core/dc.c
index 39ad385..34382d0 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc.c
@@ -2867,7 +2867,8 @@ static void commit_planes_for_stream(struct dc *dc,
 #endif
 
        if ((update_type != UPDATE_TYPE_FAST) && 
stream->update_flags.bits.dsc_changed)
-               if 
(top_pipe_to_program->stream_res.tg->funcs->lock_doublebuffer_enable) {
+               if (top_pipe_to_program &&
+                       
top_pipe_to_program->stream_res.tg->funcs->lock_doublebuffer_enable) {
                        if (should_use_dmub_lock(stream->link)) {
                                union dmub_hw_lock_flags hw_locks = { 0 };
                                struct dmub_hw_lock_inst_flags inst_flags = { 0 
};
-- 
1.8.3.1