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

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Message-ID: <1337756138.3361.1922.camel@edumazet-glaptop>
Date:	Wed, 23 May 2012 08:55:38 +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 14:47 +0800, Yanmin Zhang wrote:
> 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.

Please hold on, I'll send a v2



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