pid_namespace: pidns_get() should check task_active_pid_ns() != NULL
commit d23082257d83e4bc89727d5aedee197e907999d2 upstream. pidns_get()->get_pid_ns() can hit ns == NULL. This task_struct can't go away, but task_active_pid_ns(task) is NULL if release_task(task) was already called. Alternatively we could change get_pid_ns(ns) to check ns != NULL, but it seems that other callers are fine. Signed-off-by: Oleg Nesterov <oleg@redhat.com> Cc: Eric W. Biederman ebiederm@xmission.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -312,7 +312,9 @@ static void *pidns_get(struct task_struct *task)
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struct pid_namespace *ns;
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rcu_read_lock();
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ns = get_pid_ns(task_active_pid_ns(task));
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ns = task_active_pid_ns(task);
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if (ns)
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get_pid_ns(ns);
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rcu_read_unlock();
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return ns;
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