linux-kernel - [PATCH 3/3] inet: fix improper empty comparison

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Date:   Mon, 18 Sep 2017 12:28:57 -0400
From:   josef@...icpanda.com
To:     davem@...emloft.net, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, crobinso@...hat.com,
        labbott@...hat.com, kernel-team@...com
Cc:     Josef Bacik <jbacik@...com>, stable@...r.kernel.org
Subject: [PATCH 3/3] inet: fix improper empty comparison

From: Josef Bacik <jbacik@...com>

When doing my reuseport rework I screwed up and changed a

if (hlist_empty(&tb->owners))

to

if (!hlist_empty(&tb->owners))

This is obviously bad as all of the reuseport/reuse logic was reversed,
which caused weird problems like allowing an ipv4 bind conflict if we
opened an ipv4 only socket on a port followed by an ipv6 only socket on
the same port.

Cc: stable@...r.kernel.org
Fixes: b9470c27607b ("inet: kill smallest_size and smallest_port")
Reported-by: Cole Robinson <crobinso@...hat.com>
Signed-off-by: Josef Bacik <jbacik@...com>
---
 net/ipv4/inet_connection_sock.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/ipv4/inet_connection_sock.c b/net/ipv4/inet_connection_sock.c
index a1bf30438bc5..c039c937ba90 100644
--- a/net/ipv4/inet_connection_sock.c
+++ b/net/ipv4/inet_connection_sock.c
@@ -321,7 +321,7 @@ int inet_csk_get_port(struct sock *sk, unsigned short snum)
 			goto fail_unlock;
 	}
 success:
-	if (!hlist_empty(&tb->owners)) {
+	if (hlist_empty(&tb->owners)) {
 		tb->fastreuse = reuse;
 		if (sk->sk_reuseport) {
 			tb->fastreuseport = FASTREUSEPORT_ANY;
-- 
2.7.4