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

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Message-ID: <CAHA+R7M1qd5g1ta=YFqefgXDf1EfF2_VsJGUvH6Dd+ttnHc_VQ@mail.gmail.com>
Date:	Fri, 5 Sep 2014 11:58:31 -0700
From:	Cong Wang <cwang@...pensource.com>
To:	David Miller <davem@...emloft.net>
Cc:	Sabrina Dubroca <sd@...asysnail.net>,
	Hannes Frederic Sowa <hannes@...essinduktion.org>,
	Tommi Rantala <tt.rantala@...il.com>,
	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>,
	"linux-kernel@...r.kernel.org" <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 Fri, Sep 5, 2014 at 11:53 AM, David Miller <davem@...emloft.net> wrote:
> From: Sabrina Dubroca <sd@...asysnail.net>
> Date: Tue, 2 Sep 2014 10:29:29 +0200
>
>> 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>
>
> Applied and queued up for -stable, thanks.

I believe you applied a wrong version, at least the following
is not correct:

+       if (!dev)
+               return -ENODEV;

Sabrina took that from my draft patch, but they all don't
realize this is wrong.

(I did provide a correct version which is just ignored by you.)
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