linux-kernel - Re: [PATCH] net: netfilter/xt_CT.c: fix uninitialized variable

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Date:	Tue, 15 Jan 2013 20:16:14 +0100
From:	Cong Ding <dinggnu@...il.com>
To:	"Waskiewicz Jr, Peter P" <peter.p.waskiewicz.jr@...el.com>
Cc:	Pablo Neira Ayuso <pablo@...filter.org>,
	Patrick McHardy <kaber@...sh.net>,
	"David S. Miller" <davem@...emloft.net>,
	"netfilter-devel@...r.kernel.org" <netfilter-devel@...r.kernel.org>,
	"netfilter@...r.kernel.org" <netfilter@...r.kernel.org>,
	"coreteam@...filter.org" <coreteam@...filter.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] net: netfilter/xt_CT.c: fix uninitialized variable

On Tue, Jan 15, 2013 at 07:06:51PM +0000, Waskiewicz Jr, Peter P wrote:
> On Tue, 2013-01-15 at 19:58 +0100, Cong Ding wrote:
> > If CONFIG_NF_CONNTRACK_ZONES is not defined, the variable ret might be
> > uninitialized when it goes to err1 through line 125 and 263 respectively.
> > So I change these goto err1 to return -EINVAL directly.
> > 
> > Signed-off-by: Cong Ding <dinggnu@...il.com>
> > ---
> >  net/netfilter/xt_CT.c |    4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> > 
> > diff --git a/net/netfilter/xt_CT.c b/net/netfilter/xt_CT.c
> > index 2a08430..941f600 100644
> > --- a/net/netfilter/xt_CT.c
> > +++ b/net/netfilter/xt_CT.c
> > @@ -122,7 +122,7 @@ static int xt_ct_tg_check_v0(const struct xt_tgchk_param *par)
> >  
> >  #ifndef CONFIG_NF_CONNTRACK_ZONES
> >  	if (info->zone)
> > -		goto err1;
> > +		return -EINVAL;
> >  #endif
> >  
> >  	ret = nf_ct_l3proto_try_module_get(par->family);
> > @@ -260,7 +260,7 @@ static int xt_ct_tg_check_v1(const struct xt_tgchk_param *par)
> >  
> >  #ifndef CONFIG_NF_CONNTRACK_ZONES
> >  	if (info->zone)
> > -		goto err1;
> > +		return -EINVAL;
> >  #endif
> 
> In dropping both goto's, you left the err1 label unused.  Wouldn't just
> initializing ret to -EINVAL be easier and cleaner?  Then you wouldn't be
> messing with the flow of the function.
The label err1 are also used in line 130 and 298. I change it to "return
-EINVAL" rather than initialize ret to -EINVAL is to keep it the same as line
115 and 253.  Otherwise, we should change line 115 and 253 to be goto err1,
too?
- cong
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