linux-kernel - Re: [PATCH net v2] ipv6: fix rtnl locking in setsockopt for anycast and multicast

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Date:	Tue, 02 Sep 2014 12:07:25 +0200
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	Sabrina Dubroca <sd@...asysnail.net>
Cc:	Cong Wang <cwang@...pensource.com>,
	Tommi Rantala <tt.rantala@...il.com>,
	"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>,
	netdev <netdev@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>, trinity@...r.kernel.org,
	Dave Jones <davej@...hat.com>
Subject: Re: [PATCH net v2] ipv6: fix rtnl locking in setsockopt for anycast
 and multicast

On Di, 2014-09-02 at 10:29 +0200, Sabrina Dubroca wrote:
> Calling setsockopt with IPV6_JOIN_ANYCAST or IPV6_LEAVE_ANYCAST
> triggers the assertion in addrconf_join_solict()/addrconf_leave_solict()
> 
> ipv6_sock_ac_join(), ipv6_sock_ac_drop(), ipv6_sock_ac_close() need to
> take RTNL before calling ipv6_dev_ac_inc/dec. Same thing with
> ipv6_sock_mc_join(), ipv6_sock_mc_drop(), ipv6_sock_mc_close() before
> calling ipv6_dev_mc_inc/dec.
> 
> This patch moves ASSERT_RTNL() up a level in the call stack.
> 
> Signed-off-by: Cong Wang <xiyou.wangcong@...il.com>
> Signed-off-by: Sabrina Dubroca <sd@...asysnail.net>
> Reported-by: Tommi Rantala <tt.rantala@...il.com>
> ---
> As was said earlier, this should go in stable.
> 
> v2:
>  - based on net
>  - keep dev_get_by_flags_rcu and RCU in ipv6_sock_ac_*
>  - remove two ASSERT_RTNL() that are not necessary
> 
> Thank you for your help, Hannes!

Thanks for fixing! ;)

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


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