linux-kernel - Re: [PATCH] staging; lirc, zilog: put_ir_rx may free 'rx' which can lead to double free

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Message-ID: <alpine.LNX.2.00.1107291225560.22532@swampdragon.chaosbits.net>
Date:	Fri, 29 Jul 2011 12:26:51 +0200 (CEST)
From:	Jesper Juhl <jj@...osbits.net>
To:	Andy Walls <awalls@...metrocast.net>
cc:	Dan Carpenter <error27@...il.com>, linux-kernel@...r.kernel.org,
	devel@...verdev.osuosl.org, Jarod Wilson <jarod@...hat.com>,
	Jerome Brock <jbrock@...rs.sourceforge.net>,
	Mauro Carvalho Chehab <mchehab@...hat.com>,
	Gerd Knorr <kraxel@...dbach.in-berlin.de>,
	Jarod Wilson <jarod@...sonet.com>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Thomas Reitmayr <treitmayr@...oo.com>,
	Michal Kochanowicz <mkochano@....org.pl>,
	Christoph Bartelmus <lirc@...telmus.de>,
	Mark Weaver <mark@...l.co.uk>,
	Ulrich Mueller <ulrich.mueller42@....de>,
	Stefan Jahn <stefan@...c.org>
Subject: Re: [PATCH] staging; lirc, zilog: put_ir_rx may free 'rx' which can
 lead to double free

On Fri, 29 Jul 2011, Andy Walls wrote:

> Dan Carpenter <error27@...il.com> wrote:
> 
> >On Thu, Jul 28, 2011 at 11:49:51PM +0200, Jesper Juhl wrote:
> >> If calling put_ir_rx(rx, true); in
> >> drivers/staging/lirc/lirc_zilog.c::ir_probe() returns true (1) then
> >it
> >> means that it has freed it's first argument. Subsequently jumping to
> >> 'out_put_xx' will cause us to call put_ir_rx() once more since 'rx'
> >is
> >> not zero - leading to a double free.
> >
> >It would be better to just remove the first call to put_ir_rx().
> >
> >regards,
> >dan carpenter
> 
> Jesper,
> 
> Could you forward your original patch email to me?  I never got it.
> 
> I was the one who added all the new ref counting to lirc_zilog and it was not fun to get right (well at least what I thought was right...).
> 

Sure. I've just forwarded both the original patch mail and the mail with 
the updated version to  Andy Walls <awalls@...metrocast.net>

-- 
Jesper Juhl <jj@...osbits.net>       http://www.chaosbits.net/
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