Commit 37ad8aca authored by Tejun Heo's avatar Tejun Heo

freezer: use lock_task_sighand() in fake_signal_wake_up()

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: default avatarTejun Heo <>
Reported-by: default avatarOleg Nesterov <>
Acked-by: default avatarOleg Nesterov <>
Cc: "Rafael J. Wysocki" <>
Cc: Paul Menage <>
parent 5ece3eae
......@@ -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);
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