linux-kernel - Re: [PATCH v2 1/2] exit: pidns: alloc_pid() leaks pid_namespace if child

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Message-ID: <877fygzm0s.fsf@x220.int.ebiederm.org>
Date:	Thu, 27 Nov 2014 09:44:03 -0600
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Aaron Tomlin <atomlin@...hat.com>,
	Pavel Emelyanov <xemul@...allels.com>,
	Serge Hallyn <serge.hallyn@...ntu.com>,
	Sterling Alexander <stalexan@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] exit: pidns: alloc_pid() leaks pid_namespace if child_reaper is exiting

Oleg Nesterov <oleg@...hat.com> writes:

> alloc_pid() does get_pid_ns() beforehand but forgets to put_pid_ns()
> if it fails because disable_pid_allocation() was called by the exiting
> child_reaper.
>
> We could simply move get_pid_ns() down to successful return, but this
> fix tries to be as trivial as possible.
>
> Signed-off-by: Oleg Nesterov <oleg@...hat.com>
> Cc: stable@...r.kernel.org
Reviewed-by: "Eric W. Biederman" <ebiederm@...ssion.com>
> ---
>  kernel/pid.c |    2 ++
>  1 files changed, 2 insertions(+), 0 deletions(-)
>
> diff --git a/kernel/pid.c b/kernel/pid.c
> index 9b9a266..82430c8 100644
> --- a/kernel/pid.c
> +++ b/kernel/pid.c
> @@ -341,6 +341,8 @@ out:
>  
>  out_unlock:
>  	spin_unlock_irq(&pidmap_lock);
> +	put_pid_ns(ns);
> +
>  out_free:
>  	while (++i <= ns->level)
>  		free_pidmap(pid->numbers + i);
--
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