CVE-2021-47362

In the Linux kernel, the following vulnerability has been resolved:
drm/amd/pm: Update intermediate power state for SI Update the current state
as boot state during dpm initialization. During the subsequent
initialization, set_power_state gets called to transition to the final
power state. set_power_state refers to values from the current state and
without current state populated, it could result in NULL pointer
dereference. For ex: on platforms where PCI speed change is supported
through ACPI ATCS method, the link speed of current state needs to be
queried before deciding on changing to final power state’s link speed. The
logic to query ATCS-support was broken on certain platforms. The issue
became visible when broken ATCS-support logic got fixed with commit
f9b7f3703ff9 (“drm/amdgpu/acpi: make ATPX/ATCS structures global (v2)”).
Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/1698