linux-kernel - Re: [PATCH] procfs: Do not release pid_ns->proc

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Message-ID: <20100616161537.GA16877@hawkmoon.kerlabs.com>
Date:	Wed, 16 Jun 2010 18:15:37 +0200
From:	Louis Rilling <Louis.Rilling@...labs.com>
To:	Pavel Emelyanov <xemul@...nvz.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Linux Containers <containers@...ts.osdl.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] procfs: Do not release pid_ns->proc_mnt too early

On 16/06/10 20:04 +0400, Pavel Emelyanov wrote:
> > +void proc_new_task(struct task_struct *task)
> > +{
> > +	struct pid *pid;
> > +	int i;
> > +
> > +	if (!task->pid)
> > +		return;
> > +
> > +	pid = task_pid(task);
> > +	for (i = 0; i <= pid->level; i++)
> > +		mntget(pid->numbers[i].ns->proc_mnt);
> 
> I feel I'm missing something significant, but this patch breaks
> the mntget/mntput balance. Doesn't it?

Why?

all mntget() here have their mntput() in proc_flush_task(). At least, this is
the intent...

Thanks,

Louis

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