From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH net] net: fix keepalive code vs TCP_FASTOPEN_CONNECT
Date: Thu, 03 Aug 2017 09:35:43 -0700 (PDT)
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From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Wed, 02 Aug 2017 23:10:46 -0700

> From: Eric Dumazet <edumazet@google.com>
> 
> syzkaller was able to trigger a divide by 0 in TCP stack [1]
> 
> Issue here is that keepalive timer needs to be updated to not attempt
> to send a probe if the connection setup was deferred using
> TCP_FASTOPEN_CONNECT socket option added in linux-4.11
...
> Fixes: 19f6d3f3c842 ("net/tcp-fastopen: Add new API support")
> Signed-off-by: Eric Dumazet <edumazet@google.com>
> Reported-by: Dmitry Vyukov <dvyukov@google.com>

Applied and queued up for -stable, thanks!