linux-kernel - Re: [PATCH 1/1] tty: release_one

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Message-ID: <20100402184349.GA32229@redhat.com>
Date:	Fri, 2 Apr 2010 20:43:49 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Alan Cox <alan@...ux.intel.com>, Greg KH <greg@...ah.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Serge Hallyn <serue@...ibm.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Sukadev Bhattiprolu <sukadev@...ibm.com>, stable@...nel.org
Subject: Re: [PATCH 1/1] tty: release_one_tty() forgets to put pids

On 04/02, Linus Torvalds wrote:
>
> On Fri, 2 Apr 2010, Oleg Nesterov wrote:
> >
> > release_one_tty(tty) can be called when tty still has a reference
> > to pgrp/session. In this case we leak the pid.
>
> Hmm. Maybe we should have cleared this in tty_release() already. We
> already do some of the session clearing there (but we clear the session in
> the _tasks_ associated with the tty, not the tty session pointer).

Yes, probably we can free them earlier.

But I am very nervous about this change, I tried to defer put_pid()
as much as possible, in case something else uses ->prgp/session
before free_tty_struct().

Oleg.

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