Artful update to 4.13.14 stable release

SRU Justification

    Impact:
       The upstream process for stable tree updates is quite similar
       in scope to the Ubuntu SRU process, e.g., each patch has to
       demonstrably fix a bug, and each patch is vetted by upstream
       by originating either directly from a mainline/stable Linux tree or
       a minimally backported form of that patch. The 4.13.14 upstream stable
       patch set is now available. It should be included in the Ubuntu
       kernel as well.

       git://git.kernel.org/

    TEST CASE: TBD

       The following patches from the 4.13.14 stable release shall be applied:
* ppp: fix race in ppp device destruction
* gso: fix payload length when gso_size is zero
* ipv4: Fix traffic triggered IPsec connections.
* ipv6: Fix traffic triggered IPsec connections.
* netlink: do not set cb_running if dump's start() errs
* net: call cgroup_sk_alloc() earlier in sk_clone_lock()
* macsec: fix memory leaks when skb_to_sgvec fails
* l2tp: check ps->sock before running pppol2tp_session_ioctl()
* tun: call dev_get_valid_name() before register_netdevice()
* netlink: fix netlink_ack() extack race
* sctp: add the missing sock_owned_by_user check in sctp_icmp_redirect
* tcp/dccp: fix ireq->opt races
* packet: avoid panic in packet_getsockopt()
* geneve: Fix function matching VNI and tunnel ID on big-endian
* net: bridge: fix returning of vlan range op errors
* soreuseport: fix initialization race
* ipv6: flowlabel: do not leave opt->tot_len with garbage
* sctp: full support for ipv6 ip_nonlocal_bind & IP_FREEBIND
* tcp/dccp: fix lockdep splat in inet_csk_route_req()
* tcp/dccp: fix other lockdep splats accessing ireq_opt
* net: dsa: check master device before put
* net/unix: don't show information about sockets from other namespaces
* tap: double-free in error path in tap_open()
* net/mlx5: Fix health work queue spin lock to IRQ safe
* net/mlx5e: Properly deal with encap flows add/del under neigh update
* ipip: only increase err_count for some certain type icmp in ipip_err
* ip6_gre: only increase err_count for some certain type icmpv6 in ip6gre_err
* ip6_gre: update dst pmtu if dev mtu has been updated by toobig in __gre6_xmit
* tcp: refresh tp timestamp before tcp_mtu_probe()
* tap: reference to KVA of an unloaded module causes kernel panic
* tun: allow positive return values on dev_get_valid_name() call
* sctp: reset owner sk for data chunks on out queues when migrating a sock
* net_sched: avoid matching qdisc with zero handle
* l2tp: hold tunnel in pppol2tp_connect()
* tun/tap: sanitize TUNSETSNDBUF input
* ipv6: addrconf: increment ifp refcount before ipv6_del_addr()
* tcp: fix tcp_mtu_probe() vs highest_sack
* mac80211: accept key reinstall without changing anything
* mac80211: use constant time comparison with keys
* mac80211: don't compare TKIP TX MIC key in reinstall prevention
* usb: usbtest: fix NULL pointer dereference
* Input: ims-psu - check if CDC union descriptor is sane
* EDAC, sb_edac: Don't create a second memory controller if HA1 is not present
* dmaengine: dmatest: warn user when dma test times out
* Linux 4.13.14