[MPTCP] [RFC PATCH 0/5] mptcp: more incoming option fixes

[Paolo Abeni <pabeni at redhat.com>]

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This is a very early RFC showcasing the fix discussed in yday mtg - the
first 3 patches. It contains also fix/warkaround for the last warn() I'm
able to hit with syzbot repro provided by Christoph.

With this series and https://marc.info/?l=linux-netdev&m=158772695009150&w=2
on top of -net I haven't hit any of the 'known' oops/warn so far, but
I'm hitting a WARN_ONCE("Bad mapping: "...) I'm unsure it's 
introduced here or not.

Paolo Abeni (5):
  mptcp: add and use wrappers to manipulate mptcp opt flags
  mptcp: use a single sub_option field in mptcp_incoming_option
  tcp: init MPTCP option before parsing.
  mptcp: avoid a WARN on bad input.
  mptcp: fix 'use_ack' option access.

 include/linux/tcp.h  | 27 +++++++++-----------
 net/ipv4/tcp_input.c |  1 +
 net/mptcp/options.c  | 41 +++++++++++++++---------------
 net/mptcp/protocol.c |  2 +-
 net/mptcp/protocol.h | 60 ++++++++++++++++++++++++++++++++++++++++++++
 net/mptcp/subflow.c  | 23 ++++++++---------
 6 files changed, 105 insertions(+), 49 deletions(-)

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2.21.1