linux-kernel - Re: [PATCH 2/4] pidns: Call pid_ns_prepare_proc from create_pid

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Message-ID: <20110131132207.GA26995@redhat.com>
Date:	Mon, 31 Jan 2011 14:22:07 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Daniel Lezcano <daniel.lezcano@...e.fr>
Cc:	akpm@...ux-foundation.org, ebiederm@...ssion.com,
	containers@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, clg@...ibm.com
Subject: Re: [PATCH 2/4] pidns: Call pid_ns_prepare_proc from
	create_pid_namespace

On 01/31, Daniel Lezcano wrote:
>
> @@ -96,6 +97,9 @@ static struct pid_namespace *create_pid_namespace(struct pid_namespace *parent_p
>  	for (i = 1; i < PIDMAP_ENTRIES; i++)
>  		atomic_set(&ns->pidmap[i].nr_free, BITS_PER_PAGE);
>
> +	if (pid_ns_prepare_proc(ns))
> +		goto out_free_map;
> +
>  	return ns;

This is not right, afaics. I already sent the similar patches, but
they were ignored ;)

Please see http://marc.info/?l=linux-kernel&m=127697484000334

If pid_ns_prepare_proc() fails we shouldn't blindly return ENOMEM
and, more importantly, we need put_pid_ns(parent_ns).

Oleg.

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