netdev - Re: [PATCH net] ipvs: use skb_to_full

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Date:	Sat, 14 Nov 2015 13:37:46 +0200 (EET)
From:	Julian Anastasov <ja@....bg>
To:	Eric Dumazet <eric.dumazet@...il.com>
cc:	Sander Eikelenboom <linux@...elenboom.it>,
	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	netfilter-devel@...r.kernel.org,
	Wensong Zhang <wensong@...ux-vs.org>,
	Simon Horman <horms@...ge.net.au>, lvs-devel@...r.kernel.org
Subject: Re: [PATCH net] ipvs: use skb_to_full_sk() helper


	Hello,

On Thu, 12 Nov 2015, Eric Dumazet wrote:

> From: Eric Dumazet <edumazet@...gle.com>
> 
> SYNACK packets might be attached to request sockets.
> 
> Use skb_to_full_sk() helper to avoid illegal accesses to
> inet_sk(skb->sk)
> 
> Fixes: ca6fb0651883 ("tcp: attach SYNACK messages to request sockets instead of listener")
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Reported-by: Sander Eikelenboom <linux@...elenboom.it>

	Looks good, I guess Simon will take the patch for
the ipvs tree.

Acked-by: Julian Anastasov <ja@....bg>

> ---
>  net/netfilter/ipvs/ip_vs_core.c |   16 ++++++++--------
>  1 file changed, 8 insertions(+), 8 deletions(-)
> 
> diff --git a/net/netfilter/ipvs/ip_vs_core.c b/net/netfilter/ipvs/ip_vs_core.c
> index 1e24fff53e4b..f57b4dcdb233 100644
> --- a/net/netfilter/ipvs/ip_vs_core.c
> +++ b/net/netfilter/ipvs/ip_vs_core.c
> @@ -1176,6 +1176,7 @@ ip_vs_out(struct netns_ipvs *ipvs, unsigned int hooknum, struct sk_buff *skb, in
>  	struct ip_vs_protocol *pp;
>  	struct ip_vs_proto_data *pd;
>  	struct ip_vs_conn *cp;
> +	struct sock *sk;
>  
>  	EnterFunction(11);
>  
> @@ -1183,13 +1184,12 @@ ip_vs_out(struct netns_ipvs *ipvs, unsigned int hooknum, struct sk_buff *skb, in
>  	if (skb->ipvs_property)
>  		return NF_ACCEPT;
>  
> +	sk = skb_to_full_sk(skb);
>  	/* Bad... Do not break raw sockets */
> -	if (unlikely(skb->sk != NULL && hooknum == NF_INET_LOCAL_OUT &&
> +	if (unlikely(sk && hooknum == NF_INET_LOCAL_OUT &&
>  		     af == AF_INET)) {
> -		struct sock *sk = skb->sk;
> -		struct inet_sock *inet = inet_sk(skb->sk);
>  
> -		if (inet && sk->sk_family == PF_INET && inet->nodefrag)
> +		if (sk->sk_family == PF_INET && inet_sk(sk)->nodefrag)
>  			return NF_ACCEPT;
>  	}
>  
> @@ -1681,6 +1681,7 @@ ip_vs_in(struct netns_ipvs *ipvs, unsigned int hooknum, struct sk_buff *skb, int
>  	struct ip_vs_conn *cp;
>  	int ret, pkts;
>  	int conn_reuse_mode;
> +	struct sock *sk;
>  
>  	/* Already marked as IPVS request or reply? */
>  	if (skb->ipvs_property)
> @@ -1708,12 +1709,11 @@ ip_vs_in(struct netns_ipvs *ipvs, unsigned int hooknum, struct sk_buff *skb, int
>  	ip_vs_fill_iph_skb(af, skb, false, &iph);
>  
>  	/* Bad... Do not break raw sockets */
> -	if (unlikely(skb->sk != NULL && hooknum == NF_INET_LOCAL_OUT &&
> +	sk = skb_to_full_sk(skb);
> +	if (unlikely(sk && hooknum == NF_INET_LOCAL_OUT &&
>  		     af == AF_INET)) {
> -		struct sock *sk = skb->sk;
> -		struct inet_sock *inet = inet_sk(skb->sk);
>  
> -		if (inet && sk->sk_family == PF_INET && inet->nodefrag)
> +		if (sk->sk_family == PF_INET && inet_sk(sk)->nodefrag)
>  			return NF_ACCEPT;
>  	}

Regards

--
Julian Anastasov <ja@....bg>
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