linux-kernel - Re: [PATCH] Fix refcount leak in tty

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Message-ID: <20130724221518.GA21709@kroah.com>
Date:	Wed, 24 Jul 2013 15:15:18 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Peter Hurley <peter@...leysoftware.com>
Cc:	Gianluca Anzolin <gianluca@...tospazio.it>,
	Gustavo Padovan <gustavo@...ovan.org>,
	linux-kernel@...r.kernel.org, jslaby@...e.cz
Subject: Re: [PATCH] Fix refcount leak in tty_port.c

On Wed, Jul 24, 2013 at 10:11:47AM -0400, Peter Hurley wrote:
> On 07/12/2013 10:04 AM, Peter Hurley wrote:
> >On 07/12/2013 06:30 AM, Gustavo Padovan wrote:
> >>Hi Gianluca,
> >>
> >>* Gianluca Anzolin <gianluca@...tospazio.it> [2013-07-09 10:35:35 +0200]:
> >>
> >>>Hello,
> >>>
> >>>In linux 3.10 in the file drivers/tty/tty_port.c the function
> >>>tty_port_tty_hangup may leak a tty reference:
> >>>
> >>>         struct tty_struct *tty = tty_port_tty_get(port);
> >>>
> >>>         if (tty && (!check_clocal || !C_CLOCAL(tty))) {
> >>>                 tty_hangup(tty);
> >>>                 tty_kref_put(tty);
> >>>         }
> >>>
> >>>If tty != NULL and the second condition is false we never call tty_kref_put and
> >>>the reference is leaked.
> >
> >Good catch.
> >
> >>>Fix by nesting two if statements.
> >>>
> >>>Signed-off-by: Gianluca Anzolin <gianluca@...tospazio.it>
> >>
> >>As mentioned by Gianluca this is a regression of aa27a094 and we depend on
> >>this patch to go ahead with some fixes in the bluetooth subsystem.
> >
> >Gustavo,
> >
> >There's no direct dependency; ie., there aren't merge issues here.
> >We should progress with the fixes to rfcomm independent of this patch.
> >
> >>Gianluca, it might help if you send a proper git inline formated patch,
> >>mentioning the issue and which regression you are fixing.  It makes
> >>maintainer's life easier.
> >
> >As Gustavo points out, please inline the patch otherwise commenters
> >have to do it for you.
> 
> Gianluca,
> 
> I think Greg may be expecting you to address the comments from myself
> and Gustavo before accepting this patch.
> 
> Greg, is that the case?

Yes, I thought a new version was coming, so I dropped this one.  Can
someone please fix this up and resend?

thanks,

greg k-h
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