Re: [PATCH 1/1] pid_namespace: pidns_get() should check task_active_pid_ns() != NULL

[Oleg Nesterov]

On 04/02, Eric W. Biederman wrote:
>
> Oleg Nesterov <oleg@xxxxxxxxxx> writes:
>
> > 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.
>
> get_pid_ns already has a ns == NULL check, so no code changes should be
> needed.

Hmm...

	static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
	{
		if (ns != &init_pid_ns)
			kref_get(&ns->kref);
		return ns;
	}

?

Oleg.

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