inet: Don't lookup the socket if there's a socket attached to the skb Use the socket cached in the skb if it's present. Signed-off-by: KOVACS Krisztian <hidden@sch.bme.hu> Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index ce26c41..e51da8c 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c

@@ -111,11 +111,15 @@
 					  __be16 sport, __be16 dport,
 					  struct hlist_head udptable[])
 {
+	struct sock *sk;
 	struct ipv6hdr *iph = ipv6_hdr(skb);
 
-	return __udp6_lib_lookup(dev_net(skb->dst->dev), &iph->saddr, sport,
-				 &iph->daddr, dport, inet6_iif(skb),
-				 udptable);
+	if (unlikely(sk = skb_steal_sock(skb)))
+		return sk;
+	else
+		return __udp6_lib_lookup(dev_net(skb->dst->dev), &iph->saddr, sport,
+					 &iph->daddr, dport, inet6_iif(skb),
+					 udptable);
 }
 
 /*