In the Linux kernel, the following vulnerability has been resolved:

powercap: intel_rapl: Fix a NULL pointer dereference

A NULL pointer dereference is triggered when probing the MMIO RAPL
driver on platforms with CPU ID not listed in intel_rapl_common CPU
model list.

This is because the intel_rapl_common module still probes on such
platforms even if 'defaults_msr' is not set after commit 1488ac990ac8
("powercap: intel_rapl: Allow probing without CPUID match"). Thus the
MMIO RAPL rp->priv->defaults is NULL when registering to RAPL framework.

Fix the problem by adding sanity check to ensure rp->priv->rapl_defaults
is always valid.

kernel.org https://git.kernel.org/stable/c/0641908b906a133f1494c312a71f9fecbe2b6c78 [No types assigned]

kernel.org https://git.kernel.org/stable/c/2d1f5006ff95770da502f8cee2a224a1ff83866e [No types assigned]

kernel.org https://git.kernel.org/stable/c/2f73cf2ae5e0f4e629db5be3a4380ff7807148e6 [No types assigned]

kernel.org https://git.kernel.org/stable/c/9b254feb249981b66ccdb1dae54e757789a15ba1 [No types assigned]