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

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Date:	Sat, 27 Nov 2010 10:02:03 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Nagendra Tomar <tomer_iisc@...oo.com>
Cc:	netdev@...r.kernel.org, davem@...emloft.net,
	Evgeniy Polyakov <zbr@...emap.net>
Subject: Re: [PATCH] net-next: Fix __inet_inherit_port() to correctly
 increment bsockets and num_owners

Le vendredi 26 novembre 2010 à 16:26 -0800, Nagendra Tomar a écrit :
> 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;

Acked-by: Eric Dumazet <eric.dumazet@...il.com>

Thanks !


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