linux-kernel - Re: kernel panic in skb_copy

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Date:	Mon, 01 Jul 2013 13:36:15 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	joe.jin@...cle.com, frank.blaschka@...ibm.com,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	zheng.x.li@...cle.com, xen-devel@...ts.xen.org,
	Ian.Campbell@...rix.com, JBeulich@...e.com,
	stefano.stabellini@...citrix.com
Subject: Re: kernel panic in skb_copy_bits

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Fri, 28 Jun 2013 02:37:42 -0700

> [PATCH] neighbour: fix a race in neigh_destroy()
> 
> There is a race in neighbour code, because neigh_destroy() uses
> skb_queue_purge(&neigh->arp_queue) without holding neighbour lock,
> while other parts of the code assume neighbour rwlock is what
> protects arp_queue
> 
> Convert all skb_queue_purge() calls to the __skb_queue_purge() variant
> 
> Use __skb_queue_head_init() instead of skb_queue_head_init()
> to make clear we do not use arp_queue.lock
> 
> And hold neigh->lock in neigh_destroy() to close the race.
> 
> Reported-by: Joe Jin <joe.jin@...cle.com>
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>

Applied and queued up for -stable, thanks Eric.
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