netdev - Re: [PATCH v3 2/2] ip6_tunnel: fix potential issue in __ip6_tnl

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Date:   Wed, 7 Jun 2017 22:00:43 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     严海双 <yanhaishuang@...s.chinamobile.com>
Cc:     "=David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        Eric Dumazet <edumazet@...gle.com>
Subject: Re: [PATCH v3 2/2] ip6_tunnel: fix potential issue in __ip6_tnl_rcv

On Thu, Jun 08, 2017 at 12:56:58PM +0800, 严海双 wrote:
> 
> > On 8 Jun 2017, at 12:38 PM, Alexei Starovoitov <alexei.starovoitov@...il.com> wrote:
> > 
> > On Thu, Jun 08, 2017 at 12:32:44PM +0800, Haishuang Yan wrote:
> >> When __ip6_tnl_rcv fails, the tun_dst won't be freed, so call
> >> dst_release to free it in error code path.
> >> 
> >> CC: Alexei Starovoitov <ast@...com>
> >> Fixes: 8d79266bc48c ("ip6_tunnel: add collect_md mode to IPv6 tunnels")
> >> Signed-off-by: Haishuang Yan <yanhaishuang@...s.chinamobile.com>
> > 
> > I don't get it. Why did you send another version of the patch?
> > What was wrong with previous approach that myself and Eric acked?
> > 
> > 
> 
> Sorry for your confusing, because Pravin Shelar give a feedback in ipv4 patch, see below:

hmm. right.
Then it raises the question: How did you test this and previous patch?

since previous version was sort-of fixing the bug, but completely
breaking the logic...