smpboot: Add missing get_online_cpus() in smpboot_register_percpu_thread()
authorLai Jiangshan <laijs@cn.fujitsu.com>
Thu, 31 Jul 2014 03:30:17 +0000 (11:30 +0800)
committerThomas Gleixner <tglx@linutronix.de>
Fri, 23 Jan 2015 10:33:51 +0000 (11:33 +0100)
commit4bee96860a65c3a62d332edac331b3cf936ba3ad
tree255638c13a74a54fd7ea71cb4d9dbe0a591a98ce
parentec6f34e5b552fb0a52e6aae1a5afbbb1605cc6cc
smpboot: Add missing get_online_cpus() in smpboot_register_percpu_thread()

The following race exists in the smpboot percpu threads management:

CPU0                 CPU1
cpu_up(2)
  get_online_cpus();
  smpboot_create_threads(2);
     smpboot_register_percpu_thread();
     for_each_online_cpu();
       __smpboot_create_thread();
  __cpu_up(2);

This results in a missing per cpu thread for the newly onlined cpu2 and
in a NULL pointer dereference on a consecutive offline of that cpu.

Proctect smpboot_register_percpu_thread() with get_online_cpus() to
prevent that.

[ tglx: Massaged changelog and removed the change in
        smpboot_unregister_percpu_thread() because that's an
        optimization and therefor not stable material. ]

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Cc: David Rientjes <rientjes@google.com>
Cc: stable@vger.kernel.org
Link: http://lkml.kernel.org/r/1406777421-12830-1-git-send-email-laijs@cn.fujitsu.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
kernel/smpboot.c