hold task_lock around checks in keyctl
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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@ -1486,6 +1486,7 @@ long keyctl_session_to_parent(void)
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oldwork = NULL;
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parent = me->real_parent;
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task_lock(parent);
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/* the parent mustn't be init and mustn't be a kernel thread */
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if (parent->pid <= 1 || !parent->mm)
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goto unlock;
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@ -1529,6 +1530,7 @@ long keyctl_session_to_parent(void)
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if (!ret)
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newwork = NULL;
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unlock:
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task_unlock(parent);
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write_unlock_irq(&tasklist_lock);
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rcu_read_unlock();
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if (oldwork)
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