CVE-2023-52860

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> drivers/perf: hisi: use cpuhp_state_remove_instance_nocalls() for hisi_hns3_pmu uninit process<br /> <br /> When tearing down a &amp;#39;hisi_hns3&amp;#39; PMU, we mistakenly run the CPU hotplug<br /> callbacks after the device has been unregistered, leading to fireworks<br /> when we try to execute empty function callbacks within the driver:<br /> <br /> | Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000<br /> | CPU: 0 PID: 15 Comm: cpuhp/0 Tainted: G W O 5.12.0-rc4+ #1<br /> | Hardware name: , BIOS KpxxxFPGA 1P B600 V143 04/22/2021<br /> | pstate: 80400009 (Nzcv daif +PAN -UAO -TCO BTYPE=--)<br /> | pc : perf_pmu_migrate_context+0x98/0x38c<br /> | lr : perf_pmu_migrate_context+0x94/0x38c<br /> |<br /> | Call trace:<br /> | perf_pmu_migrate_context+0x98/0x38c<br /> | hisi_hns3_pmu_offline_cpu+0x104/0x12c [hisi_hns3_pmu]<br /> <br /> Use cpuhp_state_remove_instance_nocalls() instead of<br /> cpuhp_state_remove_instance() so that the notifiers don&amp;#39;t execute after<br /> the PMU device has been unregistered.<br /> <br /> [will: Rewrote commit message]