Messages in this thread Patch in this message | | | From | Yang Li <> | Subject | [PATCH -next] drm/amd/display: check top_pipe_to_program pointer | Date | Mon, 15 Nov 2021 16:10:19 +0800 |
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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 <abaci@linux.alibaba.com> Signed-off-by: Yang Li <yang.lee@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
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