linux-kernel - Re: [PATCH 1/7] ipvs: fix error return code

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Date:	Thu, 30 Aug 2012 10:12:15 +0900
From:	Simon Horman <horms@...ge.net.au>
To:	Julia Lawall <Julia.Lawall@...6.fr>
Cc:	Wensong Zhang <wensong@...ux-vs.org>,
	kernel-janitors@...r.kernel.org, Julian Anastasov <ja@....bg>,
	Pablo Neira Ayuso <pablo@...filter.org>,
	Patrick McHardy <kaber@...sh.net>,
	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	lvs-devel@...r.kernel.org, netfilter-devel@...r.kernel.org,
	netfilter@...r.kernel.org, coreteam@...filter.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/7] ipvs: fix error return code

On Wed, Aug 29, 2012 at 06:49:11PM +0200, Julia Lawall wrote:
> From: Julia Lawall <Julia.Lawall@...6.fr>
> 
> Initialize return variable before exiting on an error path.
> 
> A simplified version of the semantic match that finds this problem is as
> follows: (http://coccinelle.lip6.fr/)
> 
> // <smpl>
> (
> if@p1 (\(ret < 0\|ret != 0\))
>  { ... return ret; }
> |
> ret@p1 = 0
> )
> ... when != ret = e1
>     when != &ret
> *if(...)
> {
>   ... when != ret = e2
>       when forall
>  return ret;
> }
> 
> // </smpl>
> 
> Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>
> 
> ---
>  net/netfilter/ipvs/ip_vs_ctl.c |    4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/net/netfilter/ipvs/ip_vs_ctl.c b/net/netfilter/ipvs/ip_vs_ctl.c
> index 3c60137..767cc12 100644
> --- a/net/netfilter/ipvs/ip_vs_ctl.c
> +++ b/net/netfilter/ipvs/ip_vs_ctl.c
> @@ -1171,8 +1171,10 @@ ip_vs_add_service(struct net *net, struct ip_vs_service_user_kern *u,
>  		goto out_err;
>  	}
>  	svc->stats.cpustats = alloc_percpu(struct ip_vs_cpu_stats);
> -	if (!svc->stats.cpustats)
> +	if (!svc->stats.cpustats) {
> +		ret = -ENOMEM;
>  		goto out_err;
> +	}
>  
>  	/* I'm the first user of the service */
>  	atomic_set(&svc->usecnt, 0);

Acked-by: Simon Horman <horms@...ge.net.au>
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