netdev - Re: [PATCH net-next-2.6] tcp: connect() race with timewait reuse

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Message-ID: <20091202221552.GA17579@ioremap.net>
Date:	Thu, 3 Dec 2009 01:15:53 +0300
From:	Evgeniy Polyakov <zbr@...emap.net>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	David Miller <davem@...emloft.net>, kdakhane@...il.com,
	netdev@...r.kernel.org, netfilter@...r.kernel.org
Subject: Re: [PATCH net-next-2.6] tcp: connect() race with timewait reuse

Hi.

Looks very good, thanks Eric, I have one question.

On Wed, Dec 02, 2009 at 04:08:59PM +0100, Eric Dumazet (eric.dumazet@...il.com) wrote:
> +
> +/*
> + * unhash a timewait socket from established hash
> + * lock must be hold by caller
> + */
> +void inet_twsk_unhash(struct inet_timewait_sock *tw)
> +{
> +	if (hlist_nulls_unhashed(&tw->tw_node))
> +		return;
> +
> +	hlist_nulls_del_rcu(&tw->tw_node);
> +	sk_nulls_node_init(&tw->tw_node);
> +	inet_twsk_put(tw);

Is it safe to call in locked context? inet_twsk_put() schedules
preemption, also I did not check what tw destructor does.

-- 
	Evgeniy Polyakov
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