netdev - Re: [PATCH net] mptcp: fix bogus sendmsg() return code under pressure

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Message-Id: <20200803.181512.1195418774947073734.davem@davemloft.net>
Date:   Mon, 03 Aug 2020 18:15:12 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     pabeni@...hat.com
Cc:     netdev@...r.kernel.org, mptcp@...ts.01.org
Subject: Re: [PATCH net] mptcp: fix bogus sendmsg() return code under
 pressure

From: Paolo Abeni <pabeni@...hat.com>
Date: Mon,  3 Aug 2020 18:40:39 +0200

> In case of memory pressure, mptcp_sendmsg() may call
> sk_stream_wait_memory() after succesfully xmitting some
> bytes. If the latter fails we currently return to the
> user-space the error code, ignoring the succeful xmit.
> 
> Address the issue always checking for the xmitted bytes
> before mptcp_sendmsg() completes.
> 
> Fixes: f296234c98a8 ("mptcp: Add handling of incoming MP_JOIN requests")
> Reviewed-by: Matthieu Baerts <matthieu.baerts@...sares.net>
> Signed-off-by: Paolo Abeni <pabeni@...hat.com>

Applied and queued up for v5.7+ -stable, thank you.