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Date:   Thu, 9 Mar 2017 14:42:47 +1100
From:   Jonathan Maxwell <>
To:     Eric Dumazet <>
Cc:, David Miller <>,
        Eric Dumazet <>,
        Andrey Konovalov <>,
        kuznet <>, jmorris <>,
        yoshfuji <>, kaber <>,
        Neal Cardwell <>,,,,
        Jon Maxwell <>,
        Eric Garver <>,
        Hannes Sowa <>
Subject: Re: [PATCH net] dccp/tcp: fix routing redirect race

Sorry let me resend in plain text mode.

On Thu, Mar 9, 2017 at 1:10 PM, Eric Dumazet <> wrote:
> On Thu, 2017-03-09 at 12:15 +1100, Jon Maxwell wrote:
>> We have seen a few incidents lately where a dst_enty has been freed
>> with a dangling TCP socket reference (sk->sk_dst_cache) pointing to that
>> dst_entry. If the conditions/timings are right a crash then ensues when the
>> freed dst_entry is referenced later on. A Common crashing back trace is:
> Very nice catch !

Thanks Eric.

> Don't we have a similar issue for IPv6 ?

Good point.

We checked and as far as we can tell IPv6 does not invalidate the route.
So it should be safer.

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