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Taehee Yoo b61d327cd3 net: validate lwtstate->data before returning from skb_tunnel_info() 
commit 67a9c94317402b826fc3db32afc8f39336803d97 upstream.

skb_tunnel_info() returns pointer of lwtstate->data as ip_tunnel_info
type without validation. lwtstate->data can have various types such as
mpls_iptunnel_encap, etc and these are not compatible.
So skb_tunnel_info() should validate before returning that pointer.

Splat looks like:
BUG: KASAN: slab-out-of-bounds in vxlan_get_route+0x418/0x4b0 [vxlan]
Read of size 2 at addr ffff888106ec2698 by task ping/811

CPU: 1 PID: 811 Comm: ping Not tainted 5.13.0+ #1195
Call Trace:
 dump_stack_lvl+0x56/0x7b
 print_address_description.constprop.8.cold.13+0x13/0x2ee
 ? vxlan_get_route+0x418/0x4b0 [vxlan]
 ? vxlan_get_route+0x418/0x4b0 [vxlan]
 kasan_report.cold.14+0x83/0xdf
 ? vxlan_get_route+0x418/0x4b0 [vxlan]
 vxlan_get_route+0x418/0x4b0 [vxlan]
 [ ... ]
 vxlan_xmit_one+0x148b/0x32b0 [vxlan]
 [ ... ]
 vxlan_xmit+0x25c5/0x4780 [vxlan]
 [ ... ]
 dev_hard_start_xmit+0x1ae/0x6e0
 __dev_queue_xmit+0x1f39/0x31a0
 [ ... ]
 neigh_xmit+0x2f9/0x940
 mpls_xmit+0x911/0x1600 [mpls_iptunnel]
 lwtunnel_xmit+0x18f/0x450
 ip_finish_output2+0x867/0x2040
 [ ... ]

Fixes: 61adedf3e3f1 ("route: move lwtunnel state to dst_entry")
Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-07-28 09:14:26 +02:00
..
9p
…
bluetooth
Bluetooth: verify AMP hci_chan before amp_destroy
2021-05-22 10:40:20 +02:00
caif
net: caif: add proper error handling
2021-06-10 12:42:36 +02:00
irda
…
iucv
s390/iucv: do not use arrays as argument
2015-09-21 16:03:04 -07:00
netfilter
netfilter: nf_tables: fix destination register zeroing
2020-09-12 11:47:33 +02:00
netns
inet: switch IP ID generator to siphash
2019-08-25 10:51:42 +02:00
nfc
NFC: nci: fix memory leak in nci_allocate_device
2021-06-03 08:23:27 +02:00
phonet
phonet: fix building with clang
2019-03-23 13:19:44 +01:00
sctp
sctp: Don't advertise IPv4 addresses if ipv6only is set on the socket
2020-06-30 15:38:39 -04:00
tc_act
net/sched: act_tunnel_key: fix NULL dereference when 'goto chain' is used
2018-08-24 13:12:37 +02:00
6lowpan.h
6lowpan: add 802.15.4 short addr slaac
2016-06-15 20:41:22 -07:00
act_api.h
net sched: fix reporting the first-time use timestamp
2020-06-03 08:16:25 +02:00
addrconf.h
ipv6: fix memory leaks on IPV6_ADDRFORM path
2020-08-21 11:01:55 +02:00
af_ieee802154.h
ieee802154: af_ieee802154: fix typo in comment.
2015-09-17 13:20:05 +02:00
af_rxrpc.h
rxrpc: Rewrite the data and ack handling code
2016-09-08 11:10:12 +01:00
af_unix.h
af_unix: split 'u->readlock' into two: 'iolock' and 'bindlock'
2016-09-04 13:29:29 -07:00
af_vsock.h
vsock: split dwork to avoid reinitializations
2018-08-22 07:47:13 +02:00
ah.h
…
arp.h
ipv4: Define __ipv4_neigh_lookup_noref when CONFIG_INET is disabled
2019-06-11 12:22:49 +02:00
atmclip.h
…
ax25.h
ax25: fix possible use-after-free
2019-02-23 09:05:59 +01:00
ax88796.h
…
bond_3ad.h
bonding: 3ad: apply ad_actor settings changes immediately
2016-02-09 04:45:49 -05:00
bond_alb.h
…
bond_options.h
bonding: convert num_grat_arp to the new bonding option API
2015-07-27 01:05:24 -07:00
bonding.h
bonding: wait for sysfs kobject destruction before freeing struct slave
2020-12-11 13:37:57 +01:00
busy_poll.h
net: un-inline sk_busy_loop()
2015-11-18 16:17:38 -05:00
calipso.h
calipso: Add a label cache.
2016-06-27 15:06:17 -04:00
cfg80211-wext.h
…
cfg80211.h
mac80211: properly handle A-MSDUs that start with an RFC 1042 header
2021-06-03 08:23:28 +02:00
cfg802154.h
ieee802154: add netns support
2016-07-08 12:20:57 +02:00
checksum.h
csum: Update csum_block_add to use rotate instead of byteswap
2016-03-13 15:01:00 -04:00
cipso_ipv4.h
netlabel: out of bound access in cipso_v4_validate()
2017-02-18 15:11:41 +01:00
cls_cgroup.h
cls_cgroup: get sk_classid only from full sockets
2016-04-19 20:09:25 -04:00
codel_impl.h
codel: split into multiple files
2016-04-25 16:44:27 -04:00
codel_qdisc.h
net_sched: fq_codel: cache skb->truesize into skb->cb
2016-06-25 12:19:35 -04:00
codel.h
codel: split into multiple files
2016-04-25 16:44:27 -04:00
compat.h
packet: compat support for sock_fprog
2016-06-09 23:41:03 -07:00
datalink.h
…
dcbevent.h
…
dcbnl.h
…
devlink.h
devlink: remove unused priv_size
2016-08-26 11:55:18 -07:00
dn_dev.h
…
dn_fib.h
…
dn_neigh.h
netfilter: Pass net into okfn
2015-09-17 17:18:37 -07:00
dn_nsp.h
…
dn_route.h
…
dn.h
…
dsa.h
net: dsa: add port fast ageing
2016-09-23 08:38:50 -04:00
dsfield.h
…
dst_cache.h
net: add dst_cache support
2016-02-16 20:21:48 -05:00
dst_metadata.h
net: validate lwtstate->data before returning from skb_tunnel_info()
2021-07-28 09:14:26 +02:00
dst_ops.h
ipv4, ipv6: Pass net into __ip_local_out and __ip6_local_out
2015-10-08 04:27:02 -07:00
dst.h
net: Added pointer check for dst->ops->neigh_lookup in dst_neigh_lookup_skb
2020-07-22 09:10:48 +02:00
esp.h
…
ethoc.h
net/ethoc: support big-endian register layout
2015-09-23 15:33:15 -07:00
fib_rules.h
fib: add missing attribute validation for tun_id
2020-03-20 09:07:39 +01:00
firewire.h
…
flow_dissector.h
net: sched: correct flower port blocking
2020-03-11 07:53:05 +01:00
flow.h
net: flow: Remove FLOWI_FLAG_L3MDEV_SRC flag
2016-09-10 23:12:53 -07:00
flowcache.h
…
fou.h
fou: Add encap ops for IPv6 tunnels
2016-05-20 18:03:16 -04:00
fq_impl.h
net/flow_dissector: switch to siphash
2019-11-10 11:23:31 +01:00
fq.h
net/flow_dissector: switch to siphash
2019-11-10 11:23:31 +01:00
garp.h
…
gen_stats.h
net: sched: do not acquire qdisc spinlock in qdisc/class stats dump
2016-06-07 16:37:14 -07:00
genetlink.h
genetlink: remove genl_bind
2020-07-22 09:10:48 +02:00
geneve.h
net: Remove deprecated tunnel specific UDP offload functions
2016-06-17 20:23:32 -07:00
gre.h
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
2016-08-18 01:17:32 -04:00
gro_cells.h
gro_cells: make sure device is up in gro_cells_receive()
2019-03-19 13:14:10 +01:00
gtp.h
gtp: #define #define _GTP_H_ and not #define _GTP_H
2016-07-25 17:55:43 -07:00
gue.h
…
hwbm.h
net: add a hardware buffer management helper API
2016-03-14 12:19:46 -04:00
icmp.h
net: icmp: pass zeroed opts from icmp{,v6}_ndo_send before sending
2021-03-03 17:44:46 +01:00
ieee80211_radiotap.h
mac80211: add support for radiotap timestamp field
2016-09-12 11:45:45 +02:00
ieee802154_netdev.h
mac802154: constify ieee802154_llsec_ops structure
2016-01-04 20:40:41 +01:00
if_inet6.h
IPv6: fix DESYNC_FACTOR
2016-10-14 10:59:15 -04:00
ila.h
ila: Add generic ILA translation facility
2015-12-15 23:25:20 -05:00
inet6_connection_sock.h
ipv6: remove unused in6_addr struct
2016-03-22 15:45:44 -04:00
inet6_hashtables.h
tcp/dccp: do not touch listener sk_refcnt under synflood
2016-04-04 22:11:20 -04:00
inet_common.h
ip4ip6: Support for GSO/GRO
2016-05-20 18:03:17 -04:00
inet_connection_sock.h
net: refactor bind_bucket fastreuse into helper
2020-09-12 11:47:38 +02:00
inet_ecn.h
vlan: consolidate VLAN parsing code and limit max parsing depth
2020-12-11 13:37:58 +01:00
inet_frag.h
net: IP defrag: encapsulate rbtree defrag code into callable functions
2019-05-02 09:32:06 +02:00
inet_hashtables.h
tcp/dccp: fix possible race __inet_lookup_established()
2020-01-04 13:41:12 +01:00
inet_sock.h
inet: make sure to grab rcu_read_lock before using ireq->ireq_opt
2018-10-18 09:13:23 +02:00
inet_timewait_sock.h
soreuseport: initialise timewait reuseport field
2018-05-16 10:08:41 +02:00
inetpeer.h
net: ipv4: use a dedicated counter for icmp_v4 redirect packets
2019-02-23 09:05:59 +01:00
ip6_checksum.h
ipv6: Pass proto to csum_ipv6_magic as __u8 instead of unsigned short
2016-03-13 23:55:13 -04:00
ip6_fib.h
ipv6: fix sparse warning on rt6i_node
2017-09-20 08:19:53 +02:00
ip6_route.h
net: ipv6: fix return value of ip6_skb_dst_mtu
2021-07-28 09:14:25 +02:00
ip6_tunnel.h
ip6_tunnel: allow not to count pkts on tstats by passing dev as NULL
2019-07-21 09:05:57 +02:00
ip_fib.h
net: ipv4: Fix memory leak in network namespace dismantle
2019-01-31 08:12:33 +01:00
ip_tunnels.h
ip_tunnel: add collect_md mode to IPIP tunnel
2016-09-17 10:13:07 -04:00
ip_vs.h
ipvs: move old_secure_tcp into struct netns_ipvs
2019-11-12 19:15:57 +01:00
ip.h
net/ipv4: always honour route mtu during forwarding
2020-10-29 09:05:31 +01:00
ipcomp.h
…
ipconfig.h
…
ipv6_frag.h
ip6: fix skb leak in ip6frag_expire_frag_queue()
2019-09-16 08:19:33 +02:00
ipv6.h
net: ipv6: add net argument to ip6_dst_lookup_flow
2020-05-20 08:15:30 +02:00
ipx.h
…
iw_handler.h
wext: handle NULL extra data in iwe_stream_add_point better
2017-08-11 08:49:34 -07:00
kcm.h
kcm: Use stream parser
2016-08-17 19:36:23 -04:00
l3mdev.h
ipvlan, l3mdev: fix broken l3s mode wrt local routes
2019-02-06 17:33:27 +01:00
lapb.h
…
lib80211.h
…
llc_c_ac.h
…
llc_c_ev.h
…
llc_c_st.h
…
llc_conn.h
llc: fix sk_buff leak in llc_conn_service()
2019-11-06 12:18:24 +01:00
llc_if.h
…
llc_pdu.h
…
llc_s_ac.h
…
llc_s_ev.h
…
llc_s_st.h
…
llc_sap.h
…
llc.h
llc: avoid blocking in llc_sap_close()
2019-11-25 09:52:18 +01:00
lwtunnel.h
lwtunnel: valid encap attr check should return 0 when lwtunnel is disabled
2017-02-18 15:11:42 +01:00
mac80211.h
mac80211: round IEEE80211_TX_STATUS_HEADROOM up to multiple of 4
2018-05-30 07:50:28 +02:00
mac802154.h
ieee802154: cleanup WARN_ON for fc fetch
2016-07-08 13:23:12 +02:00
mip6.h
…
mld.h
…
mpls_iptunnel.h
mpls: multipath route support
2015-10-23 06:26:42 -07:00
mpls.h
openvswitch: use mpls_hdr
2016-10-03 02:00:22 -04:00
mrp.h
…
ncsi.h
net/ncsi: Introduce ncsi_stop_dev()
2016-10-04 02:11:51 -04:00
ndisc.h
6lowpan: introduce 6lowpan-nd
2016-06-15 20:41:23 -07:00
neighbour.h
net: add annotations on hh->hh_len lockless accesses
2020-01-12 11:24:19 +01:00
net_namespace.h
netns: provide pure entropy for net_hash_mix()
2019-04-17 08:36:46 +02:00
net_ratelimit.h
…
netevent.h
neigh: Send a notification when DELAY_PROBE_TIME changes
2016-07-05 09:06:29 -07:00
netlabel.h
netlabel: Implement CALIPSO config functions for SMACK.
2016-06-27 15:06:18 -04:00
netlink.h
netlink: fix nla_put_{u8,u16,u32} for KASAN
2017-10-12 11:51:25 +02:00
netprio_cgroup.h
net: wrap sock->sk_cgrp_prioidx and ->sk_classid inside a struct
2015-12-08 22:02:33 -05:00
netrom.h
…
nexthop.h
net: fix rtnh_ok()
2018-05-16 10:08:41 +02:00
nl802154.h
ieee802154: add netns support
2016-07-08 12:20:57 +02:00
p8022.h
…
ping.h
net: ping: make ping_v6_sendmsg static
2016-03-23 22:09:58 -04:00
pkt_cls.h
net/sched: pkt_cls: change tc actions order to be as the user sets
2016-09-28 05:02:44 -04:00
pkt_sched.h
net: sched: convert qdisc linked list to hashtable
2016-08-10 17:19:02 -07:00
pptp.h
pptp: Refactor the struct and macros of PPTP codes
2016-08-15 10:55:53 -07:00
protocol.h
udp: Remove udp_offloads
2016-04-07 16:53:30 -04:00
psnap.h
…
raw.h
sock: struct proto hash function may error
2016-02-11 03:54:14 -05:00
rawv6.h
…
red.h
sch_red: fix off-by-one checks in red_check_params()
2021-04-16 11:59:07 +02:00
regulatory.h
regulatory: add NUL to request alpha2
2018-05-30 07:50:30 +02:00
request_sock.h
inet: reqsk_alloc() needs to take care of dead listeners
2016-04-04 22:11:19 -04:00
rose.h
…
route.h
ipv4: lock mtu in fnhe when received PMTU < net.ipv4.route.min_pmtu
2018-05-30 07:50:36 +02:00
rtnetlink.h
can: dev: Move device back to init netns on owning netns delete
2021-03-30 14:41:42 +02:00
sch_generic.h
sch_netem: fix rcu splat in netem_enqueue()
2019-11-06 12:18:25 +01:00
scm.h
unix: correctly track in-flight fds in sending process user_struct
2016-02-08 10:30:42 -05:00
secure_seq.h
…
slhc_vj.h
slip: Check if rstate is initialized before uncompressing
2018-04-20 08:21:07 +02:00
snmp.h
net: snmp: fix 64bit stats on 32bit arches
2016-04-28 11:49:45 -04:00
sock_reuseport.h
soreuseport: fix NULL ptr dereference SO_REUSEPORT after bind
2016-01-19 14:44:23 -05:00
sock.h
inet: annotate date races around sk->sk_txhash
2021-06-30 08:49:20 -04:00
Space.h
…
stp.h
…
strparser.h
kcm: Remove TCP specific references from kcm and strparser
2016-08-28 23:32:41 -04:00
switchdev.h
switchdev: remove FIB offload infrastructure
2016-09-28 04:48:00 -04:00
tcp_states.h
…
tcp.h
tcp: cache line align MAX_TCP_HEADER
2020-05-02 17:23:08 +02:00
timewait_sock.h
inet: remove BUG_ON() in twsk_destructor()
2015-07-09 15:12:20 -07:00
transp_v6.h
ipv6: add new struct ipcm6_cookie
2016-05-03 16:08:14 -04:00
tso.h
net: tso: add support for IPv6
2015-10-26 22:24:22 -07:00
udp_tunnel.h
vxlan: Add new UDP encapsulation offload type for VXLAN-GPE
2016-06-17 20:23:32 -07:00
udp.h
udp: must lock the socket in udp_disconnect()
2016-10-20 14:45:52 -04:00
udplite.h
udplite: fix partial checksum initialization
2018-03-11 16:21:32 +01:00
vsock_addr.h
…
vxlan.h
vxlan: fix hlist corruption
2017-07-21 07:42:18 +02:00
wext.h
…
wimax.h
…
x25.h
net: x25: fix one potential use-after-free issue
2018-04-13 19:48:00 +02:00
x25device.h
…
xfrm.h
xfrm: clone XFRMA_REPLAY_ESN_VAL in xfrm_do_migrate
2020-10-14 09:48:16 +02:00