linux-kernel - Re: [PATVH] media, dvb, IX2505V: Remember to free allocated memory in failure path (ix2505v

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Date:	Fri, 31 Dec 2010 12:21:42 +0000
From:	Malcolm Priestley <tvboxspy@...il.com>
To:	Mauro Carvalho Chehab <mchehab@...radead.org>
Cc:	Jesper Juhl <jj@...osbits.net>, linux-media@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATVH] media, dvb, IX2505V: Remember to free allocated memory
 in failure path (ix2505v_attach()).

On Fri, 2010-12-31 at 08:30 -0200, Mauro Carvalho Chehab wrote:
> Em 30-12-2010 21:11, Jesper Juhl escreveu:
> > Hi,
> > 
> > We may leak the storage allocated to 'state' in 
> > drivers/media/dvb/frontends/ix2505v.c::ix2505v_attach() on error.
> > This patch makes sure we free the allocated memory in the failure case.
> > 
> > 
> > Signed-off-by: Jesper Juhl <jj@...osbits.net>
> > ---
> >  ix2505v.c |    1 +
> >  1 file changed, 1 insertion(+)
> > 
> >   Compile tested only.
> > 
> > diff --git a/drivers/media/dvb/frontends/ix2505v.c b/drivers/media/dvb/frontends/ix2505v.c
> > index 55f2eba..fcb173d 100644
> > --- a/drivers/media/dvb/frontends/ix2505v.c
> > +++ b/drivers/media/dvb/frontends/ix2505v.c
> > @@ -293,6 +293,7 @@ struct dvb_frontend *ix2505v_attach(struct dvb_frontend *fe,
> >  		ret = ix2505v_read_status_reg(state);
> >  
> >  		if (ret & 0x80) {
> > +			kfree(state);
> 
> Instead of doing the free here, please move it to happen at the error: logic.
> Currently, there's just one error condition, but having part of the release/kfree
> logic here and there is not a good idea.
> 
> >  			deb_i2c("%s: No IX2505V found\n", __func__);
> >  			goto error;
> >  		}

The state is already freed in ix2505v_release on error.


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