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

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Date:	Fri, 29 Jul 2011 09:08:22 +0300
From:	Dan Carpenter <error27@...il.com>
To:	Jesper Juhl <jj@...osbits.net>
Cc:	linux-kernel@...r.kernel.org, devel@...verdev.osuosl.org,
	Jarod Wilson <jarod@...hat.com>,
	Jerome Brock <jbrock@...rs.sourceforge.net>,
	Andy Walls <awalls@...metrocast.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 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

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