From: Eric Dumazet <eric.dumazet@gmail.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@oracle.com>
> Signed-off-by: Eric Dumazet <edumazet@google.com>
Applied and queued up for -stable, thanks Eric.