From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH net-next] tcp: better validation of received ack
 sequences
Date: Thu, 25 May 2017 12:48:17 -0400 (EDT)
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From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Tue, 23 May 2017 15:24:46 -0700

> Add a FLAG_NO_CHALLENGE_ACK so that tcp_rcv_state_process()
> can choose to send a challenge ACK and discard the packet instead
> of wrongly change socket state.

Applied, but the tests end up being double-negatives so it might
have been easier to understand if the flag was a positive rather
than a negative value.