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Haishuang Yan cd1aa9c2c6 ip_vti: fix a null pointer deferrence when create vti fallback tunnel 
After set fb_tunnels_only_for_init_net to 1, the itn->fb_tunnel_dev will
be NULL and will cause following crash:

[ 2742.849298] BUG: unable to handle kernel NULL pointer dereference at 0000000000000941
[ 2742.851380] PGD 800000042c21a067 P4D 800000042c21a067 PUD 42aaed067 PMD 0
[ 2742.852818] Oops: 0002 [#1] SMP PTI
[ 2742.853570] CPU: 7 PID: 2484 Comm: unshare Kdump: loaded Not tainted 4.18.0-rc8+ #2
[ 2742.855163] Hardware name: Fedora Project OpenStack Nova, BIOS seabios-1.7.5-11.el7 04/01/2014
[ 2742.856970] RIP: 0010:vti_init_net+0x3a/0x50 [ip_vti]
[ 2742.858034] Code: 90 83 c0 48 c7 c2 20 a1 83 c0 48 89 fb e8 6e 3b f6 ff 85 c0 75 22 8b 0d f4 19 00 00 48 8b 93 00 14 00 00 48 8b 14 ca 48 8b 12 <c6> 82 41 09 00 00 04 c6 82 38 09 00 00 45 5b c3 66 0f 1f 44 00 00
[ 2742.861940] RSP: 0018:ffff9be28207fde0 EFLAGS: 00010246
[ 2742.863044] RAX: 0000000000000000 RBX: ffff8a71ebed4980 RCX: 0000000000000013
[ 2742.864540] RDX: 0000000000000000 RSI: 0000000000000013 RDI: ffff8a71ebed4980
[ 2742.866020] RBP: ffff8a71ea717000 R08: ffffffffc083903c R09: ffff8a71ea717000
[ 2742.867505] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8a71ebed4980
[ 2742.868987] R13: 0000000000000013 R14: ffff8a71ea5b49c0 R15: 0000000000000000
[ 2742.870473] FS:  00007f02266c9740(0000) GS:ffff8a71ffdc0000(0000) knlGS:0000000000000000
[ 2742.872143] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 2742.873340] CR2: 0000000000000941 CR3: 000000042bc20006 CR4: 00000000001606e0
[ 2742.874821] Call Trace:
[ 2742.875358]  ops_init+0x38/0xf0
[ 2742.876078]  setup_net+0xd9/0x1f0
[ 2742.876789]  copy_net_ns+0xb7/0x130
[ 2742.877538]  create_new_namespaces+0x11a/0x1d0
[ 2742.878525]  unshare_nsproxy_namespaces+0x55/0xa0
[ 2742.879526]  ksys_unshare+0x1a7/0x330
[ 2742.880313]  __x64_sys_unshare+0xe/0x20
[ 2742.881131]  do_syscall_64+0x5b/0x180
[ 2742.881933]  entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reproduce:
echo 1 > /proc/sys/net/core/fb_tunnels_only_for_init_net
modprobe ip_vti
unshare -n

Fixes: 79134e6ce2c9 ("net: do not create fallback tunnels for non-default namespaces")
Cc: Eric Dumazet <edumazet@google.com>
Signed-off-by: Haishuang Yan <yanhaishuang@cmss.chinamobile.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2018-08-19 11:26:39 -07:00
..
bpfilter
bpfilter: remove trailing newline
2018-07-24 14:10:42 -07:00
netfilter
Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-next
2018-07-20 22:28:28 -07:00
af_inet.c
net: ipv4: Control SKB reprioritization after forwarding
2018-08-01 09:52:30 -07:00
ah4.c
net: use -ENOSPC for transient busy indication
2017-11-03 22:11:17 +08:00
arp.c
proc: introduce proc_create_net{,_data}
2018-05-16 07:24:30 +02:00
cipso_ipv4.c
tcp/dccp: fix ireq->opt races
2017-10-21 01:33:19 +01:00
datagram.c
…
devinet.c
route: add support for directed broadcast forwarding
2018-07-29 12:37:06 -07:00
esp4_offload.c
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec-next
2018-07-27 09:33:37 -07:00
esp4.c
esp4: remove redundant initialization of pointer esph
2018-02-13 13:59:03 +01:00
fib_frontend.c
ipv4: remove BUG_ON() from fib_compute_spec_dst
2018-07-28 19:06:12 -07:00
fib_lookup.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
fib_notifier.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
fib_rules.c
net: fib_rules: add extack support
2018-04-23 10:21:24 -04:00
fib_semantics.c
net: metrics: add proper netlink validation
2018-06-05 12:29:43 -04:00
fib_trie.c
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next
2018-06-06 18:39:49 -07:00
fou.c
Merge ra.kernel.org:/pub/scm/linux/kernel/git/davem/net
2018-07-03 10:29:26 +09:00
gre_demux.c
…
gre_offload.c
Merge ra.kernel.org:/pub/scm/linux/kernel/git/davem/net
2018-07-03 10:29:26 +09:00
icmp.c
ipv4: ipcm_cookie initializers
2018-07-07 10:58:49 +09:00
igmp.c
Merge ra.kernel.org:/pub/scm/linux/kernel/git/davem/net
2018-08-02 10:55:32 -07:00
inet_connection_sock.c
bpf: Introduce BPF_PROG_TYPE_SK_REUSEPORT
2018-08-11 01:58:46 +02:00
inet_diag.c
sock_diag: request _diag module only when the family or proto has been registered
2018-03-12 11:03:42 -04:00
inet_fragment.c
ip: process in-order fragments efficiently
2018-08-11 17:54:18 -07:00
inet_hashtables.c
bpf: Enable BPF_PROG_TYPE_SK_REUSEPORT bpf prog in reuseport selection
2018-08-11 01:58:46 +02:00
inet_timewait_sock.c
soreuseport: initialise timewait reuseport field
2018-04-07 22:32:32 -04:00
inetpeer.c
inetpeer: fix uninit-value in inet_getpeer
2018-04-09 10:57:35 -04:00
ip_forward.c
net: ipv4: Control SKB reprioritization after forwarding
2018-08-01 09:52:30 -07:00
ip_fragment.c
ip: process in-order fragments efficiently
2018-08-11 17:54:18 -07:00
ip_gre.c
ip_gre: remove redundant variables t_hlen
2018-08-01 09:58:15 -07:00
ip_input.c
net: ipv4: fix listify ip_rcv_finish in case of forwarding
2018-07-12 16:40:19 -07:00
ip_options.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
ip_output.c
Merge ra.kernel.org:/pub/scm/linux/kernel/git/davem/net
2018-07-24 19:21:58 -07:00
ip_sockglue.c
ip: in cmsg IP(V6)_ORIGDSTADDR call pskb_may_pull
2018-07-24 16:35:58 -07:00
ip_tunnel_core.c
net/ipv4: Update ip_tunnel_metadata_cnt static key to modern api
2018-05-10 15:13:33 -04:00
ip_tunnel.c
ip_tunnel: Fix name string concatenate in __ip_tunnel_create()
2018-06-07 16:27:16 -04:00
ip_vti.c
ip_vti: fix a null pointer deferrence when create vti fallback tunnel
2018-08-19 11:26:39 -07:00
ipcomp.c
…
ipconfig.c
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next
2018-06-06 18:39:49 -07:00
ipip.c
net: Drop pernet_operations::async
2018-03-27 13:18:09 -04:00
ipmr_base.c
rhashtable: split rhashtable.h
2018-06-22 13:43:27 +09:00
ipmr.c
net: ipmr: add support for passing full packet on wrong vif
2018-07-13 14:21:16 -07:00
Kconfig
net: remove blank lines at end of file
2018-07-24 14:10:43 -07:00
Makefile
net: remove blank lines at end of file
2018-07-24 14:10:43 -07:00
metrics.c
net: metrics: add proper netlink validation
2018-06-05 12:29:43 -04:00
netfilter.c
netfilter: utils: move nf_ip_checksum* from ipv4 to utils
2018-07-16 17:51:48 +02:00
netlink.c
ipv4: support sport, dport and ip_proto in RTM_GETROUTE
2018-05-23 15:14:12 -04:00
ping.c
net: add helpers checking if socket can be bound to nonlocal address
2018-08-01 09:50:04 -07:00
proc.c
ip: discard IPv4 datagrams with overlapping segments.
2018-08-05 17:16:46 -07:00
protocol.c
…
raw_diag.c
net: ipv6: add second dif to raw socket lookups
2017-08-07 11:39:22 -07:00
raw.c
ip: remove tx_flags from ipcm_cookie and use same logic for v4 and v6
2018-07-07 10:58:49 +09:00
route.c
route: add support for directed broadcast forwarding
2018-07-29 12:37:06 -07:00
syncookies.c
net/ipv4: disable SMC TCP option with SYN Cookies
2018-03-25 20:53:54 -04:00
sysctl_net_ipv4.c
net: ipv4: Notify about changes to ip_forward_update_priority
2018-08-01 09:52:30 -07:00
tcp_bbr.c
Merge ra.kernel.org:/pub/scm/linux/kernel/git/davem/net
2018-08-02 10:55:32 -07:00
tcp_bic.c
tcp: consolidate congestion control undo functions
2017-08-06 21:25:10 -07:00
tcp_cdg.c
tcp: cdg: make struct tcp_cdg static
2017-10-16 21:24:25 +01:00
tcp_cong.c
tcp: Namespace-ify sysctl_tcp_default_congestion_control
2017-11-15 14:09:52 +09:00
tcp_cubic.c
tcp: consolidate congestion control undo functions
2017-08-06 21:25:10 -07:00
tcp_dctcp.c
tcp: avoid resetting ACK timer in DCTCP
2018-08-11 11:31:35 -07:00
tcp_diag.c
net: sock: replace sk_state_load with inet_sk_state_load and remove sk_state_store
2017-12-20 14:00:25 -05:00
tcp_fastopen.c
tcp: pause Fast Open globally after third consecutive timeout
2017-12-13 15:51:12 -05:00
tcp_highspeed.c
tcp: consolidate congestion control undo functions
2017-08-06 21:25:10 -07:00
tcp_htcp.c
tcp: fix cwnd undo in Reno and HTCP congestion controls
2017-08-06 21:25:10 -07:00
tcp_hybla.c
…
tcp_illinois.c
net/tcp/illinois: replace broken algorithm reference link
2018-02-28 12:03:47 -05:00
tcp_input.c
tcp: avoid resetting ACK timer upon receiving packet with ECN CWR flag
2018-08-11 11:31:35 -07:00
tcp_ipv4.c
Merge ra.kernel.org:/pub/scm/linux/kernel/git/torvalds/linux
2018-07-20 21:17:12 -07:00
tcp_lp.c
tcp: switch TCP TS option (RFC 7323) to 1ms clock
2017-05-17 16:06:01 -04:00
tcp_metrics.c
net: Drop pernet_operations::async
2018-03-27 13:18:09 -04:00
tcp_minisocks.c
tcp: use monotonic timestamps for PAWS
2018-07-12 14:50:40 -07:00
tcp_nv.c
tcp_nv: fix potential integer overflow in tcpnv_acked
2018-01-31 10:26:30 -05:00
tcp_offload.c
tcp: Don't coalesce decrypted and encrypted SKBs
2018-07-16 00:12:09 -07:00
tcp_output.c
tcp: remove set but not used variable 'skb_size'
2018-08-01 09:57:09 -07:00
tcp_rate.c
tcp: expose both send and receive intervals for rate sample
2018-07-11 23:01:56 -07:00
tcp_recovery.c
tcp: add stat of data packet reordering events
2018-08-01 09:56:10 -07:00
tcp_scalable.c
tcp: consolidate congestion control undo functions
2017-08-06 21:25:10 -07:00
tcp_timer.c
tcp: make function tcp_retransmit_stamp() static
2018-07-25 16:35:45 -07:00
tcp_ulp.c
tcp, ulp: fix leftover icsk_ulp_ops preventing sock from reattach
2018-08-16 14:58:08 -07:00
tcp_vegas.c
tcp: fix under-evaluated ssthresh in TCP Vegas
2017-09-29 06:07:00 +01:00
tcp_vegas.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
tcp_veno.c
tcp: consolidate congestion control undo functions
2017-08-06 21:25:10 -07:00
tcp_westwood.c
tcp: Revert "tcp: remove CA_ACK_SLOWPATH"
2017-08-30 11:20:08 -07:00
tcp_yeah.c
tcp: consolidate congestion control undo functions
2017-08-06 21:25:10 -07:00
tcp.c
tcp: remove unneeded variable 'err'
2018-08-03 16:52:07 -07:00
tunnel4.c
inet: whitespace cleanup
2018-02-28 11:43:28 -05:00
udp_diag.c
udp: fix rx queue len reported by diag and proc interface
2018-06-08 19:55:15 -04:00
udp_impl.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
udp_offload.c
Merge ra.kernel.org:/pub/scm/linux/kernel/git/davem/net
2018-07-03 10:29:26 +09:00
udp_tunnel.c
net: add infrastructure to un-offload UDP tunnel port
2017-07-24 13:52:59 -07:00
udp.c
bpf: Enable BPF_PROG_TYPE_SK_REUSEPORT bpf prog in reuseport selection
2018-08-11 01:58:46 +02:00
udplite.c
proc: introduce proc_create_net{,_data}
2018-05-16 07:24:30 +02:00
xfrm4_input.c
xfrm: Reinject transport-mode packets through tasklet
2017-12-19 08:23:21 +01:00
xfrm4_mode_beet.c
networking: make skb_pull & friends return void pointers
2017-06-16 11:48:39 -04:00
xfrm4_mode_transport.c
xfrm: Add encapsulation header offsets while SKB is not encrypted
2017-04-14 10:07:39 +02:00
xfrm4_mode_tunnel.c
xfrm: Verify MAC header exists before overwriting eth_hdr(skb)->h_proto
2018-03-07 10:54:29 +01:00
xfrm4_output.c
net: xfrm: use skb_gso_validate_network_len() to check gso sizes
2018-03-04 17:49:17 -05:00
xfrm4_policy.c
net: Drop pernet_operations::async
2018-03-27 13:18:09 -04:00
xfrm4_protocol.c
…
xfrm4_state.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
xfrm4_tunnel.c
…