[PATCH mptcp-net 0/4] mptcp: fix duplicate subflow creation

[Paolo Abeni <pabeni@redhat.com>]

As reported by Mat, the in kernel PM can, in some edge scenarios,
unexpectedly create multiple subflows with the same local and remote
address.

The real fix is implemented by patch 4/4 with some more accurate check
at subflow creation time.

Patches 1-3 are roughly optional pre-requisities, added to avoid
introducing more data-races with the actual fix. Patch 1/4 is a bit
debatable, as it changes the existing ULP API, but I could not find a
better solution and there is some similar prior art:
commit 0df48c26d841 ("tcp: add tcpi_bytes_acked to tcp_info")

Paolo Abeni (4):
  mptcp: fix lockless access in subflow ULP diag
  mptcp: fix data races on local_id
  mptcp: fix data races on remote_id
  mptcp: fix duplicate subflow creation

 include/net/tcp.h      |  2 +-
 net/mptcp/diag.c       |  6 +++++-
 net/mptcp/pm_netlink.c | 43 ++++++++++++++++++++++--------------------
 net/mptcp/protocol.c   |  2 +-
 net/mptcp/protocol.h   | 15 ++++++++++++---
 net/mptcp/subflow.c    | 15 ++++++++-------
 net/tls/tls_main.c     |  2 +-
 7 files changed, 51 insertions(+), 34 deletions(-)

-- 
2.43.0