From 03c5b534185f9844c1b5fcfdbae2adc32821ec42 Mon Sep 17 00:00:00 2001
From: Eric Dumazet <edumazet@google.com>
Date: Sat, 9 Apr 2016 08:01:13 -0700
Subject: ipv6: fix inet6_lookup_listener()
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

A stupid refactoring bug in inet6_lookup_listener() needs to be fixed
in order to get proper SO_REUSEPORT behavior.

Fixes: 3b24d854cb35 ("tcp/dccp: do not touch listener sk_refcnt under synflood")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Maciej Żenczykowski <maze@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv6/inet6_hashtables.c b/net/ipv6/inet6_hashtables.c
index 607da08..f167838 100644
--- a/net/ipv6/inet6_hashtables.c
+++ b/net/ipv6/inet6_hashtables.c
@@ -137,7 +137,7 @@ struct sock *inet6_lookup_listener(struct net *net,
 	sk_for_each(sk, &ilb->head) {
 		score = compute_score(sk, net, hnum, daddr, dif);
 		if (score > hiscore) {
-			hiscore = score;
+			reuseport = sk->sk_reuseport;
 			if (reuseport) {
 				phash = inet6_ehashfn(net, daddr, hnum,
 						      saddr, sport);
@@ -148,7 +148,7 @@ struct sock *inet6_lookup_listener(struct net *net,
 				matches = 1;
 			}
 			result = sk;
-			reuseport = sk->sk_reuseport;
+			hiscore = score;
 		} else if (score == hiscore && reuseport) {
 			matches++;
 			if (reciprocal_scale(phash, matches) == 0)
-- 
cgit v0.10.2