drm/amd/display: check top_pipe_to_program pointer
stable inclusion from stable-v5.10.94 commit 019fe9723a83cef67e772baae6065f5d4bc0bb31 bugzilla: https://gitee.com/openeuler/kernel/issues/I531X9 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=019fe9723a83cef67e772baae6065f5d4bc0bb31 -------------------------------- [ Upstream commit a689e8d1 ] 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: NAbaci Robot <abaci@linux.alibaba.com> Signed-off-by: NYang Li <yang.lee@linux.alibaba.com> Signed-off-by: NAlex Deucher <alexander.deucher@amd.com> Signed-off-by: NSasha Levin <sashal@kernel.org> Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com> Acked-by: NXie XiuQi <xiexiuqi@huawei.com>
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