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

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Message-ID: <1337755623.14538.194.camel@ymzhang.sh.intel.com>
Date:	Wed, 23 May 2012 14:47:03 +0800
From:	Yanmin Zhang <yanmin_zhang@...ux.intel.com>
To:	Eric Dumazet <eric.dumazet@...il.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 08:27 +0200, Eric Dumazet wrote:
> On Wed, 2012-05-23 at 14:15 +0800, Yanmin Zhang wrote:
> 
> > 
> > Besides fi->fib_dev here, we need check fi->fib_hash, fi->fib_lhash,
> > and nexthop_nh->nh_hash.
> 
> No, its not needed.
I am checking it now.
fib_create_info=>fib_find_info, but fib_find_info is not protected by
fib_info_lock. See the codes:


link_it:
        ofi = fib_find_info(fi);
        if (ofi) {
                fi->fib_dead = 1;
                free_fib_info(fi);
                ofi->fib_treeref++;
                return ofi;
        }

> 
> I am sending a patch, because I feel this area is too complex for non
> netdev guys.
Indeed, it's complicated. I will test your patches.


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