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

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Date:	Fri, 05 Sep 2014 21:12:56 +0200
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	Cong Wang <cwang@...pensource.com>
Cc:	David Miller <davem@...emloft.net>,
	Sabrina Dubroca <sd@...asysnail.net>,
	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 Fr, 2014-09-05 at 11:58 -0700, Cong Wang wrote:
> 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.)

What games are you playing? You know how patches are processed by David
and I even let him the choice by pointing out a problem in your patch so
that you could an update and send v2.

I really feel miffed about your behavior!

Anyway, I saw the hunk adding the return -ENODEV and didn't see any
problems with it. Sure it might be better if it would gone into a
separate patch. Can you elaborate what problems you see?

Thanks,
Hannes


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