Linux cpufreq/amd-pstate - unchecked cpufreq_cpu_get() return value: cpufreq_cpu_get() can return NULL and amd-pstate

Impact

cpufreq_cpu_get() can return NULL and amd-pstate did not check it, giving a kernel NULL dereference and a host panic. Availability failure in always-running platform code.

Who can reach it

Local, on the amd-pstate path.

What to do

Distro kernel update plus reboot.

References

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