netdev - Re: [PATCH net] ipv6: fix possible use after free of dev stats

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Message-ID: <1433778377.13489.18.camel@stressinduktion.org>
Date:	Mon, 08 Jun 2015 17:46:17 +0200
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	Robert Shearman <rshearma@...cade.com>
Cc:	netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>
Subject: Re: [PATCH net] ipv6: fix possible use after free of dev stats

On Fr, 2015-06-05 at 18:51 +0100, Robert Shearman wrote:
> 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 <rshearma@...cade.com>

Acked-by: Hannes Frederic Sowa <hannes@...essinduktion.org>

Thanks!


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