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Gao Feng 175b38277b netfilter: nf_ct_helper: Fix possible panic after nf_conntrack_helper_unregister 
[ Upstream commit ad9852af97 ]

The helper module would be unloaded after nf_conntrack_helper_unregister,
so it may cause a possible panic caused by race.

nf_ct_iterate_destroy(unhelp, me) reset the helper of conntrack as NULL,
but maybe someone has gotten the helper pointer during this period. Then
it would panic, when it accesses the helper and the module was unloaded.

Take an example as following:
CPU0                                                   CPU1
ctnetlink_dump_helpinfo
helper = rcu_dereference(help->helper);
                                                       unhelp
                                                       set helper as NULL
                                                       unload helper module
helper->to_nlattr(skb, ct);

As above, the cpu0 tries to access the helper and its module is unloaded,
then the panic happens.

Signed-off-by: Gao Feng <gfree.wind@vip.163.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-08-24 13:08:57 +02:00
..
6lowpan License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
9p 9p/trans_virtio: discard zero-length reply 2018-02-22 15:42:30 +01:00
802 License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
8021q net: fix use-after-free in GRO with ESP 2018-07-22 14:28:44 +02:00
appletalk License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
atm atm: Preserve value of skb->truesize when accounting to vcc 2018-07-22 14:28:43 +02:00
ax25 License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
batman-adv batman-adv: fix packet loss for broadcasted DHCP packets to a server 2018-05-30 07:52:19 +02:00
bluetooth Bluetooth: avoid killing an already killed socket 2018-08-22 07:46:11 +02:00
bpf
bridge netfilter: ebtables: reject non-bridge targets 2018-07-22 14:28:49 +02:00
caif License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
can can: af_can: canfd_rcv(): replace WARN_ONCE by pr_warn_once 2018-01-23 19:58:17 +01:00
ceph libceph, ceph: avoid memory leak when specifying same option several times 2018-05-30 07:52:04 +02:00
core rtnetlink: add rtnl_link_state check in rtnl_configure_link 2018-07-28 07:55:42 +02:00
dcb rtnetlink: make rtnl_register accept a flags parameter 2017-08-09 16:57:38 -07:00
dccp dccp: fix undefined behavior with 'cwnd' shift in ccid2_cwnd_restart() 2018-08-22 07:46:08 +02:00
decnet dn_getsockoptdecnet: move nf_{get/set}sockopt outside sock lock 2018-02-25 11:07:52 +01:00
dns_resolver KEYS: DNS: fix parsing multiple options 2018-07-22 14:28:49 +02:00
dsa net: dsa: Do not suspend/resume closed slave_dev 2018-08-06 16:20:48 +02:00
ethernet
hsr net/hsr: Check skb_put_padto() return value 2017-08-22 13:40:23 -07:00
ieee802154 ieee802154: 6lowpan: fix possible NULL deref in lowpan_device_event() 2018-03-31 18:10:40 +02:00
ife net: sched: ife: check on metadata length 2018-04-29 11:33:13 +02:00
ipv4 ipv4: frags: handle possible skb truesize change 2018-08-06 16:20:47 +02:00
ipv6 netfilter: ipv6: nf_defrag: reduce struct net memory waste 2018-08-24 13:08:57 +02:00
ipx License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
iucv net/iucv: Free memory obtained by kzalloc 2018-03-31 18:10:41 +02:00
kcm kcm: Fix use-after-free caused by clonned sockets 2018-06-11 22:49:19 +02:00
key af_key: Always verify length of provided sadb_key 2018-06-16 09:45:14 +02:00
l2tp l2tp: use sk_dst_check() to avoid race on sk->sk_dst_cache 2018-08-22 07:46:08 +02:00
l3mdev
lapb net, lapb: convert lapb_cb.refcnt from atomic_t to refcount_t 2017-07-04 22:35:16 +01:00
llc llc: use refcount_inc_not_zero() for llc_sap_find() 2018-08-22 07:46:08 +02:00
mac80211 mac80211: use timeout from the AddBA response instead of the request 2018-06-21 04:02:55 +09:00
mac802154 License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
mpls mpls, nospec: Sanitize array index in mpls_label_ok() 2018-02-22 15:42:28 +01:00
ncsi net/ncsi: Fix length of GVI response packet 2017-10-21 01:56:38 +01:00
netfilter netfilter: nf_ct_helper: Fix possible panic after nf_conntrack_helper_unregister 2018-08-24 13:08:57 +02:00
netlabel netlabel: If PF_INET6, check sk_buff ip header version 2018-05-30 07:52:40 +02:00
netlink netlink: Don't shift on 64 for ngroups 2018-08-09 12:16:38 +02:00
netrom net, netrom: convert nr_node.refcount from atomic_t to refcount_t 2017-07-04 22:35:17 +01:00
nfc net/nfc: Avoid stalls when nfc_alloc_send_skb() returned NULL. 2018-07-22 14:28:49 +02:00
nsh nsh: set mac len based on inner packet 2018-07-22 14:28:49 +02:00
openvswitch openvswitch: Don't swap table in nlattr_set() after OVS_ATTR_NESTED is found 2018-05-19 10:20:24 +02:00
packet net/packet: fix use-after-free 2018-07-22 14:28:46 +02:00
phonet License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
psample MAINTAINERS: Update Yotam's E-mail 2017-11-01 12:19:03 +09:00
qrtr qrtr: add MODULE_ALIAS macro to smd 2018-05-30 07:52:05 +02:00
rds rds: avoid unenecessary cong_update in loop transport 2018-07-22 14:28:49 +02:00
rfkill rfkill: gpio: fix memory leak in probe error path 2018-05-16 10:10:26 +02:00
rose
rxrpc rxrpc: Fix user call ID check in rxrpc_service_prealloc_one 2018-08-06 16:20:48 +02:00
sched cls_matchall: fix tcf_unbind_filter missing 2018-08-22 07:46:11 +02:00
sctp sctp: not allow transport timeout value less than HZ/5 for hb_timer 2018-06-11 22:49:20 +02:00
smc smc: fix sendpage() call 2018-06-21 04:02:53 +09:00
strparser strparser: Remove early eaten to fix full tcp receive buffer stall 2018-07-22 14:28:47 +02:00
sunrpc xprtrdma: Fix corner cases when handling device removal 2018-07-22 14:28:42 +02:00
switchdev net: switchdev: Remove bridge bypass support from switchdev 2017-08-07 14:48:48 -07:00
tipc tipc: eliminate KMSAN uninit-value in strcmp complaint 2018-06-21 04:02:56 +09:00
tls sock: fix sg page frag coalescing in sk_alloc_sg 2018-07-28 07:55:42 +02:00
unix License cleanup: add SPDX license identifiers to some files 2017-11-02 10:04:46 -07:00
vmw_vsock vsock: split dwork to avoid reinitializations 2018-08-22 07:46:08 +02:00
wimax License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
wireless cfg80211: clear wep keys after disconnection 2018-05-30 07:51:58 +02:00
x25 License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
xfrm xfrm: Fix transport mode skb control buffer usage. 2018-05-30 07:52:19 +02:00
compat.c net: support compat 64-bit time in {s,g}etsockopt 2018-05-19 10:20:24 +02:00
Kconfig net: Remove CONFIG_NETFILTER_DEBUG and _ASSERT() macros. 2017-09-04 13:25:20 +02:00
Makefile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
socket.c net: socket: fix potential spectre v1 gadget in socketcall 2018-08-06 16:20:48 +02:00
sysctl_net.c