netdev - Re: [PATCH net-next-2.6] fib: use atomic_inc_not_zero() in fib_rules

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Date:	Mon, 27 Sep 2010 21:51:47 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	netdev@...r.kernel.org, paulmck@...ux.vnet.ibm.com
Subject: Re: [PATCH net-next-2.6] fib: use atomic_inc_not_zero() in
 fib_rules_lookup

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Mon, 27 Sep 2010 16:18:27 +0200

> It seems we dont use appropriate refcount increment in an
> rcu_read_lock() protected section.
> 
> fib_rule_get() might increment a null refcount and bad things could
> happen.
> 
> While fib_nl_delrule() respects an rcu grace period before calling
> fib_rule_put(), fib_rules_cleanup_ops() calls fib_rule_put() without a
> grace period.
> 
> Note : after this patch, we might avoid the synchronize_rcu() call done
> in fib_nl_delrule()
> 
> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>

Applied.
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