linux-kernel - Re: [PATCH] ipv4: fix the rcu race between free_fib_info and ip_route_output

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Message-ID: <1337757238.3361.1965.camel@edumazet-glaptop>
Date:	Wed, 23 May 2012 09:13:58 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Yanmin Zhang <yanmin_zhang@...ux.intel.com>
Cc:	David Miller <davem@...emloft.net>, kunx.jiang@...el.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ipv4: fix the rcu race between free_fib_info and
 ip_route_output_slow

On Wed, 2012-05-23 at 08:55 +0200, Eric Dumazet wrote:

> Please hold on, I'll send a v2

I believe your patch should be fine, if you move back the
fib_info_cnt--;

So only do the dev_put() in free_fib_info_rcu().

No need to clear nh_dev to NULL since we are freeing fi at the end of
function.



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