From: Florian Westphal <[email protected]>
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 <[email protected]>
Applied and queued up for -stable, thanks.
