Hi: [NET]: Verify gso_type too in gso_segment
We don't want nasty Xen guests to pass a TCPv6 packet in with gso_type set to TCPv4 or even UDP (or a packet that's both TCP and UDP). Signed-off-by: Herbert Xu <[EMAIL PROTECTED]> Cheers, -- Visit Openswan at http://www.openswan.org/ Email: Herbert Xu ~{PmV>HI~} <[EMAIL PROTECTED]> Home Page: http://gondor.apana.org.au/~herbert/ PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt -- diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c index 8d15715..318d467 100644 --- a/net/ipv4/af_inet.c +++ b/net/ipv4/af_inet.c @@ -1106,7 +1106,15 @@ static struct sk_buff *inet_gso_segment( int ihl; int id; - if (!pskb_may_pull(skb, sizeof(*iph))) + if (unlikely(skb_shinfo(skb)->gso_type & + ~(SKB_GSO_TCPV4 | + SKB_GSO_UDP | + SKB_GSO_DODGY | + SKB_GSO_TCP_ECN | + 0))) + goto out; + + if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) goto out; iph = skb->nh.iph; @@ -1114,7 +1122,7 @@ static struct sk_buff *inet_gso_segment( if (ihl < sizeof(*iph)) goto out; - if (!pskb_may_pull(skb, ihl)) + if (unlikely(!pskb_may_pull(skb, ihl))) goto out; skb->h.raw = __skb_pull(skb, ihl); @@ -1125,7 +1133,7 @@ static struct sk_buff *inet_gso_segment( rcu_read_lock(); ops = rcu_dereference(inet_protos[proto]); - if (ops && ops->gso_segment) + if (likely(ops && ops->gso_segment)) segs = ops->gso_segment(skb, features); rcu_read_unlock(); diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index 59e30ba..2f81374 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -2155,6 +2155,14 @@ struct sk_buff *tcp_tso_segment(struct s unsigned int oldlen; unsigned int len; + if (unlikely(skb_shinfo(skb)->gso_type & + ~(SKB_GSO_TCPV4 | + SKB_GSO_DODGY | + SKB_GSO_TCP_ECN | + SKB_GSO_TCPV6 | + 0))) + goto out; + if (!pskb_may_pull(skb, sizeof(*th))) goto out; diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c index 25f8bf8..03b65aa 100644 --- a/net/ipv6/ipv6_sockglue.c +++ b/net/ipv6/ipv6_sockglue.c @@ -65,6 +65,14 @@ static struct sk_buff *ipv6_gso_segment( struct inet6_protocol *ops; int proto; + if (unlikely(skb_shinfo(skb)->gso_type & + ~(SKB_GSO_UDP | + SKB_GSO_DODGY | + SKB_GSO_TCP_ECN | + SKB_GSO_TCPV6 | + 0))) + goto out; + if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h)))) goto out; - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
