netdev - [PATCH] net-next: Fix __inet_inherit_port() to correctly increment bsockets and num

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Message-ID: <844781.48196.qm@web53701.mail.re2.yahoo.com>
Date:	Fri, 26 Nov 2010 16:26:27 -0800 (PST)
From:	Nagendra Tomar <tomer_iisc@...oo.com>
To:	netdev@...r.kernel.org
Cc:	davem@...emloft.net, Evgeniy Polyakov <zbr@...emap.net>,
	Eric Dumazet <eric.dumazet@...il.com>
Subject: [PATCH] net-next: Fix __inet_inherit_port() to correctly increment bsockets and num_owners

inet sockets corresponding to passive connections are added to the bind hash
using ___inet_inherit_port(). These sockets are later removed from the bind 
hash using __inet_put_port(). These two functions are not exactly symmetrical. 
__inet_put_port() decrements hashinfo->bsockets and tb->num_owners, whereas 
___inet_inherit_port() does not increment them. This results in both of these 
going to -ve values.

This patch fixes this by calling inet_bind_hash() from ___inet_inherit_port(),
which does the right thing.

'bsockets' and 'num_owners' were introduced by commit a9d8f9110d7e953c 
(inet: Allowing more than 64k connections and heavily optimize bind(0))

Signed-off-by: Nagendra Singh Tomar <tomer_iisc@...oo.com>

---
--- linux-2.6.37-rc3/net/ipv4/inet_hashtables.c.orig	2010-11-26 13:28:51.034811940 -0500
+++ linux-2.6.37-rc3/net/ipv4/inet_hashtables.c	2010-11-26 14:41:41.006268035 -0500
@@ -133,8 +133,7 @@ int __inet_inherit_port(struct sock *sk,
 			}
 		}
 	}
-	sk_add_bind_node(child, &tb->owners);
-	inet_csk(child)->icsk_bind_hash = tb;
+	inet_bind_hash(child, tb, port);
 	spin_unlock(&head->lock);

 	return 0;
--- 	

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