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: 79134e6ce2 ("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
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_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_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_htcp.c
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_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_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_westwood.c	tcp: Revert "tcp: remove CA_ACK_SLOWPATH"	2017-08-30 11:20:08 -07:00
tcp_yeah.c
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
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
xfrm4_mode_transport.c
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