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

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Message-Id: <6CE04FE7-4904-4047-95F5-80461324CDA6@cmss.chinamobile.com>
Date:   Thu, 8 Jun 2017 15:33:58 +0800
From:   严海双 <yanhaishuang@...s.chinamobile.com>
To:     Alexei Starovoitov <alexei.starovoitov@...il.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 8 Jun 2017, at 1:00 PM, Alexei Starovoitov <alexei.starovoitov@...il.com> wrote:
> 
> 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...
> 
> 

Sorry for my previous fault, I tried to fix this problem in theory without testing carefully.
I have tested the latest patches, it works ok now.