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Date:   Fri, 14 Aug 2020 14:12:39 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     fw@...len.de
Cc:     netdev@...r.kernel.org, mathew.j.martineau@...ux.intel.com,
        matthieu.baerts@...sares.net, mptcp@...ts.01.org
Subject: Re: [PATCH net] mptcp: sendmsg: reset iter on error

From: Florian Westphal <fw@...len.de>
Date: Fri, 14 Aug 2020 15:56:34 +0200

> Once we've copied data from the iterator we need to revert in case we
> end up not sending any data.
> 
> This bug doesn't trigger with normal 'poll' based tests, because
> we only feed a small chunk of data to kernel after poll indicated
> POLLOUT.  With blocking IO and large writes this triggers. Receiver
> ends up with less data than it should get.
> 
> Fixes: 72511aab95c94d ("mptcp: avoid blocking in tcp_sendpages")
> Signed-off-by: Florian Westphal <fw@...len.de>

Applied and queued up for -stable, thanks.

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