CVE-2024-49918

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> drm/amd/display: Add null check for head_pipe in dcn32_acquire_idle_pipe_for_head_pipe_in_layer<br /> <br /> This commit addresses a potential null pointer dereference issue in the<br /> `dcn32_acquire_idle_pipe_for_head_pipe_in_layer` function. The issue<br /> could occur when `head_pipe` is null.<br /> <br /> The fix adds a check to ensure `head_pipe` is not null before asserting<br /> it. If `head_pipe` is null, the function returns NULL to prevent a<br /> potential null pointer dereference.<br /> <br /> Reported by smatch:<br /> drivers/gpu/drm/amd/amdgpu/../display/dc/resource/dcn32/dcn32_resource.c:2690 dcn32_acquire_idle_pipe_for_head_pipe_in_layer() error: we previously assumed &amp;#39;head_pipe&amp;#39; could be null (see line 2681)