CVE-2024-44958

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> sched/smt: Fix unbalance sched_smt_present dec/inc<br /> <br /> I got the following warn report while doing stress test:<br /> <br /> jump label: negative count!<br /> WARNING: CPU: 3 PID: 38 at kernel/jump_label.c:263 static_key_slow_try_dec+0x9d/0xb0<br /> Call Trace:<br /> <br /> __static_key_slow_dec_cpuslocked+0x16/0x70<br /> sched_cpu_deactivate+0x26e/0x2a0<br /> cpuhp_invoke_callback+0x3ad/0x10d0<br /> cpuhp_thread_fun+0x3f5/0x680<br /> smpboot_thread_fn+0x56d/0x8d0<br /> kthread+0x309/0x400<br /> ret_from_fork+0x41/0x70<br /> ret_from_fork_asm+0x1b/0x30<br /> <br /> <br /> Because when cpuset_cpu_inactive() fails in sched_cpu_deactivate(),<br /> the cpu offline failed, but sched_smt_present is decremented before<br /> calling sched_cpu_deactivate(), it leads to unbalanced dec/inc, so<br /> fix it by incrementing sched_smt_present in the error path.