netdev - [PATCH net 0/4] mptcp: fix sockopt crash and lockdep splats

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Date:   Wed, 29 Jan 2020 15:54:42 +0100
From:   Florian Westphal <fw@...len.de>
To:     <netdev@...r.kernel.org>
Cc:     matthieu.baerts@...sares.net, mathew.j.martineau@...ux.intel.com
Subject: [PATCH net 0/4] mptcp: fix sockopt crash and lockdep splats

Christoph Paasch reported a few bugs and lockdep splats triggered by
syzkaller.

One patch fixes a crash in set/getsockopt.
Two patches fix lockdep splats related to the order in which RTNL
and socket lock are taken.

Last patch fixes out-of-bounds access when TCP syncookies are used.

Change since last iteration on mptcp-list:
 - add needed refcount in patch 2
 - call tcp_get/setsockopt directly in patch 2

 Other patches unchanged except minor amends to commit messages.

 include/linux/tcp.h   |  2 --
 net/ipv4/syncookies.c |  4 ++++
 net/ipv4/tcp_input.c  |  3 +++
 net/ipv6/syncookies.c |  3 +++
 net/mptcp/protocol.c  | 54 ++++++++++++++++++++++++++++++++----------------------
 net/mptcp/subflow.c   |  5 ++++-
 6 files changed, 46 insertions(+), 25 deletions(-)