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freezer: use lock_task_sighand() in fake_signal_wake_up()

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cgroup_freezer calls freeze_task() without holding tasklist_lock and,
if the task is exiting, its ->sighand may be gone by the time
fake_signal_wake_up() is called.  Use lock_task_sighand() instead of
accessing ->sighand directly.

Signed-off-by: Tejun Heo <[email protected]>
Reported-by: Oleg Nesterov <[email protected]>
Acked-by: Oleg Nesterov <[email protected]>
Cc: "Rafael J. Wysocki" <[email protected]>
Cc: Paul Menage <[email protected]>
This commit is contained in:
Tejun Heo 2011-11-21 12:32:26 -08:00
commit 37ad8aca94
1 changed files with 4 additions and 3 deletions
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7
kernel/freezer.c
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@ -93,9 +93,10 @@ static void fake_signal_wake_up(struct task_struct *p)
{
unsigned long flags;
spin_lock_irqsave(&p->sighand->siglock, flags);
signal_wake_up(p, 0);
spin_unlock_irqrestore(&p->sighand->siglock, flags);
if (lock_task_sighand(p, &flags)) {
signal_wake_up(p, 0);
unlock_task_sighand(p, &flags);
}
}
/**