CVE-2021-47368

In the Linux kernel, the following vulnerability has been resolved: enetc:
Fix illegal access when reading affinity_hint irq_set_affinity_hit() stores
a reference to the cpumask_t parameter in the irq descriptor, and that
reference can be accessed later from irq_affinity_hint_proc_show(). Since
the cpu_mask parameter passed to irq_set_affinity_hit() has only temporary
storage (it’s on the stack memory), later accesses to it are illegal. Thus
reads from the corresponding procfs affinity_hint file can result in paging
request oops. The issue is fixed by the get_cpu_mask() helper, which
provides a permanent storage for the cpumask_t parameter.