From: Robert Shearman <rshea...@brocade.com>
Date: Fri, 5 Jun 2015 18:51:54 +0100

> The memory pointed to by idev->stats.icmpv6msgdev,
> idev->stats.icmpv6dev and idev->stats.ipv6 can each be used in an RCU
> read context without taking a reference on idev. For example, through
> IP6_*_STATS_* calls in ip6_rcv. These memory blocks are freed without
> waiting for an RCU grace period to elapse. This could lead to the
> memory being written to after it has been freed.
> 
> Fix this by using call_rcu to free the memory used for stats, as well
> as idev after an RCU grace period has elapsed.
> 
> Signed-off-by: Robert Shearman <rshea...@brocade.com>

Applied.
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