CVE-2023-52860

In the Linux kernel, the following vulnerability has been resolved:
drivers/perf: hisi: use cpuhp_state_remove_instance_nocalls() for
hisi_hns3_pmu uninit process When tearing down a ‘hisi_hns3’ PMU, we
mistakenly run the CPU hotplug callbacks after the device has been
unregistered, leading to fireworks when we try to execute empty function
callbacks within the driver: | Unable to handle kernel NULL pointer
dereference at virtual address 0000000000000000 | CPU: 0 PID: 15 Comm:
cpuhp/0 Tainted: G W O 5.12.0-rc4+ #1 | Hardware name: , BIOS KpxxxFPGA 1P
B600 V143 04/22/2021 | pstate: 80400009 (Nzcv daif +PAN -UAO -TCO BTYPE=–)
| pc : perf_pmu_migrate_context+0x98/0x38c | lr :
perf_pmu_migrate_context+0x94/0x38c | | Call trace: |
perf_pmu_migrate_context+0x98/0x38c | hisi_hns3_pmu_offline_cpu+0x104/0x12c
[hisi_hns3_pmu] Use cpuhp_state_remove_instance_nocalls() instead of
cpuhp_state_remove_instance() so that the notifiers don’t execute after the
PMU device has been unregistered. [will: Rewrote commit message]