linux/net/ipv6/netfilter
Florian Westphal 84379c9afe netfilter: ipv6: nf_defrag: drop skb dst before queueing
Eric Dumazet reports:
 Here is a reproducer of an annoying bug detected by syzkaller on our production kernel
 [..]
 ./b78305423 enable_conntrack
 Then :
 sleep 60
 dmesg | tail -10
 [  171.599093] unregister_netdevice: waiting for lo to become free. Usage count = 2
 [  181.631024] unregister_netdevice: waiting for lo to become free. Usage count = 2
 [  191.687076] unregister_netdevice: waiting for lo to become free. Usage count = 2
 [  201.703037] unregister_netdevice: waiting for lo to become free. Usage count = 2
 [  211.711072] unregister_netdevice: waiting for lo to become free. Usage count = 2
 [  221.959070] unregister_netdevice: waiting for lo to become free. Usage count = 2

Reproducer sends ipv6 fragment that hits nfct defrag via LOCAL_OUT hook.
skb gets queued until frag timer expiry -- 1 minute.

Normally nf_conntrack_reasm gets called during prerouting, so skb has
no dst yet which might explain why this wasn't spotted earlier.

Reported-by: Eric Dumazet <eric.dumazet@gmail.com>
Reported-by: John Sperbeck <jsperbeck@google.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
Tested-by: Eric Dumazet <edumazet@google.com>
Reported-by: syzbot <syzkaller@googlegroups.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2018-07-09 18:04:12 +02:00
..
ip6_tables.c netfilter: x_tables: set module owner for icmp(6) matches 2018-07-05 11:45:11 +02:00
ip6t_ah.c
ip6t_eui64.c
ip6t_frag.c
ip6t_hbh.c
ip6t_ipv6header.c
ip6t_MASQUERADE.c netfilter: add NAT support for shifted portmap ranges 2018-04-24 10:29:12 +02:00
ip6t_mh.c
ip6t_NPT.c xtables: extend matches and targets with .usersize 2017-01-09 17:24:55 +01:00
ip6t_REJECT.c netfilter: x_tables: use pr ratelimiting in all remaining spots 2018-02-14 21:05:38 +01:00
ip6t_rpfilter.c netfilter: ip6t_rpfilter: provide input interface for route lookup 2018-05-23 09:25:54 +02:00
ip6t_rt.c
ip6t_srh.c netfilter: ip6t_srh: extend SRH matching for previous, next and last SID 2018-05-06 23:33:03 +02:00
ip6t_SYNPROXY.c netfilter: ctnetlink: synproxy support 2018-03-20 14:39:31 +01:00
ip6table_filter.c net: Drop pernet_operations::async 2018-03-27 13:18:09 -04:00
ip6table_mangle.c net: Drop pernet_operations::async 2018-03-27 13:18:09 -04:00
ip6table_nat.c netfilter: nf_nat: add nat type hooks to nat core 2018-05-23 09:14:06 +02:00
ip6table_raw.c net: Drop pernet_operations::async 2018-03-27 13:18:09 -04:00
ip6table_security.c net: Drop pernet_operations::async 2018-03-27 13:18:09 -04:00
Kconfig netfilter: Libify xt_TPROXY 2018-06-03 00:02:05 +02:00
Makefile netfilter: Libify xt_TPROXY 2018-06-03 00:02:05 +02:00
nf_conntrack_l3proto_ipv6.c net: Drop pernet_operations::async 2018-03-27 13:18:09 -04:00
nf_conntrack_proto_icmpv6.c netfilter: conntrack: timeouts can be const 2018-01-08 18:01:02 +01:00
nf_conntrack_reasm.c netfilter: ipv6: nf_defrag: drop skb dst before queueing 2018-07-09 18:04:12 +02:00
nf_defrag_ipv6_hooks.c net: Drop pernet_operations::async 2018-03-27 13:18:09 -04:00
nf_dup_ipv6.c netfilter: kill the fake untracked conntrack objects 2017-04-15 11:47:57 +02:00
nf_flow_table_ipv6.c netfilter: nf_flow_table: move init code to nf_flow_table_core.c 2018-04-24 10:28:45 +02:00
nf_log_ipv6.c net: Drop pernet_operations::async 2018-03-27 13:18:09 -04:00
nf_nat_l3proto_ipv6.c netfilter: nf_nat: add nat type hooks to nat core 2018-05-23 09:14:06 +02:00
nf_nat_masquerade_ipv6.c netfilter: nat: merge ipv4/ipv6 masquerade code into main nat module 2018-05-29 00:25:36 +02:00
nf_nat_proto_icmpv6.c netfilter: add NAT support for shifted portmap ranges 2018-04-24 10:29:12 +02:00
nf_reject_ipv6.c networking: make skb_put & friends return void pointers 2017-06-16 11:48:39 -04:00
nf_socket_ipv6.c netfilter: nf_socket: Fix out of bounds access in nf_sk_lookup_slow_v{4,6} 2018-03-24 21:17:14 +01:00
nf_tproxy_ipv6.c netfilter: nf_tproxy: fix possible non-linear access to transport header 2018-07-06 14:32:44 +02:00
nft_chain_nat_ipv6.c netfilter: nf_nat: add nat type hooks to nat core 2018-05-23 09:14:06 +02:00
nft_chain_route_ipv6.c netfilter: nf_tables: nft_register_chain_type() returns void 2018-03-30 11:29:18 +02:00
nft_dup_ipv6.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2016-11-15 10:54:36 -05:00
nft_fib_ipv6.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-03-06 01:20:46 -05:00
nft_masq_ipv6.c netfilter: add NAT support for shifted portmap ranges 2018-04-24 10:29:12 +02:00
nft_redir_ipv6.c netfilter: add NAT support for shifted portmap ranges 2018-04-24 10:29:12 +02:00
nft_reject_ipv6.c netfilter: nf_tables: use hook state from xt_action_param structure 2016-11-03 11:52:34 +01:00