Hello,
On Thu, 12 Nov 2015, Eric Dumazet wrote:
> From: Eric Dumazet <edumazet@xxxxxxxxxx>
>
> 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@xxxxxxxxxx>
> Reported-by: Sander Eikelenboom <linux@xxxxxxxxxxxxxx>
Looks good, I guess Simon will take the patch for
the ipvs tree.
Acked-by: Julian Anastasov <ja@xxxxxx>
> ---
> 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@xxxxxx>
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