From: Paolo Abeni <pab...@redhat.com> Date: Thu, 17 Sep 2020 23:07:24 +0200
> Christoph reported an infinite loop in the subflow receive path > under stress condition. > > If there are multiple subflows, each of them using a large send > buffer, the delta between the sequence number used by > MPTCP-level retransmission can and the current msk->ack_seq > can be greater than MAX_INT. > > In the above scenario, when calling mptcp_subflow_discard_data(), > such delta will be truncated to int, and could result in a negative > number: no bytes will be dropped, and subflow_check_data_avail() > will try again to process the same packet, looping forever. > > This change addresses the issue by expanding the 'limit' size to 64 > bits, so that overflows are not possible anymore. > > Closes: https://github.com/multipath-tcp/mptcp_net-next/issues/87 > Fixes: 6719331c2f73 ("mptcp: trigger msk processing even for OoO data") > Reported-and-tested-by: Christoph Paasch <cpaa...@apple.com> > Signed-off-by: Paolo Abeni <pab...@redhat.com> > --- > net-next patch, as the culprit commit is only on net-next currently Applied, thank you.
