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Eric Dumazet 4e43e64d0f ipv6: fix lockdep splat in in6_dump_addrs() 
As reported by syzbot, we should not use rcu_dereference()
when rcu_read_lock() is not held.

WARNING: suspicious RCU usage
5.19.0-rc2-syzkaller #0 Not tainted

net/ipv6/addrconf.c:5175 suspicious rcu_dereference_check() usage!

other info that might help us debug this:

rcu_scheduler_active = 2, debug_locks = 1
1 lock held by syz-executor326/3617:
 #0: ffffffff8d5848e8 (rtnl_mutex){+.+.}-{3:3}, at: netlink_dump+0xae/0xc20 net/netlink/af_netlink.c:2223

stack backtrace:
CPU: 0 PID: 3617 Comm: syz-executor326 Not tainted 5.19.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 in6_dump_addrs+0x12d1/0x1790 net/ipv6/addrconf.c:5175
 inet6_dump_addr+0x9c1/0xb50 net/ipv6/addrconf.c:5300
 netlink_dump+0x541/0xc20 net/netlink/af_netlink.c:2275
 __netlink_dump_start+0x647/0x900 net/netlink/af_netlink.c:2380
 netlink_dump_start include/linux/netlink.h:245 [inline]
 rtnetlink_rcv_msg+0x73e/0xc90 net/core/rtnetlink.c:6046
 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2501
 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
 netlink_unicast+0x543/0x7f0 net/netlink/af_netlink.c:1345
 netlink_sendmsg+0x917/0xe10 net/netlink/af_netlink.c:1921
 sock_sendmsg_nosec net/socket.c:714 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:734
 ____sys_sendmsg+0x6eb/0x810 net/socket.c:2492
 ___sys_sendmsg+0xf3/0x170 net/socket.c:2546
 __sys_sendmsg net/socket.c:2575 [inline]
 __do_sys_sendmsg net/socket.c:2584 [inline]
 __se_sys_sendmsg net/socket.c:2582 [inline]
 __x64_sys_sendmsg+0x132/0x220 net/socket.c:2582
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x46/0xb0

Fixes: 88e2ca3080 ("mld: convert ifmcaddr6 to RCU")
Reported-by: syzbot <syzkaller@googlegroups.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Taehee Yoo <ap420073@gmail.com>
Link: https://lore.kernel.org/r/20220628121248.858695-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
 		2022-06-29 20:41:09 -07:00
..
ila net: ipv6: check return value of rhashtable_init 2021-09-28 12:59:24 +01:00
netfilter netfilter: conntrack: skip verification of zero UDP checksum 2022-05-13 18:56:28 +02:00
Kconfig ipv6: ioam: Add support for the ip6ip6 encapsulation 2021-10-04 12:53:35 +01:00
Makefile net: ipv6: use ipv6-y directly instead of ipv6-objs 2021-09-28 13:13:40 +01:00
addrconf.c ipv6: fix lockdep splat in in6_dump_addrs() 2022-06-29 20:41:09 -07:00
addrconf_core.c ipv6: add net device refcount tracker to struct inet6_dev 2021-12-06 16:05:11 -08:00
addrlabel.c ipv6: addrlabel: fix possible memory leak in ip6addrlbl_net_init 2020-11-25 11:20:16 -08:00
af_inet6.c ipv6: Use ipv6_only_sock() helper in condition. 2022-04-22 12:47:50 +01:00
ah6.c ipv6: ah6: use swap() to make code cleaner 2021-11-18 12:00:15 +00:00
anycast.c ipv6: fix memory leaks on IPV6_ADDRFORM path 2020-07-30 16:30:55 -07:00
calipso.c cipso,calipso: resolve a number of problems with the DOI refcounts 2021-03-04 15:26:57 -08:00
datagram.c net: annotate races around sk->sk_bound_dev_if 2022-05-16 10:31:05 +01:00
esp6.c xfrm: free not used XFRM_ESP_NO_TRAILER flag 2022-05-06 08:24:20 +02:00
esp6_offload.c net: Fix esp GSO on inter address family tunnels. 2022-03-07 13:14:04 +01:00
exthdrs.c net: ipv6: add skb drop reasons to TLV parse 2022-04-13 13:09:57 +01:00
exthdrs_core.c
…
exthdrs_offload.c
…
fib6_notifier.c
…
fib6_rules.c ipv6: change fib6_rules_net_exit() to batch mode 2022-02-08 20:41:34 -08:00
fou6.c net: Add MODULE_DESCRIPTION entries to network modules 2020-06-20 21:33:57 -07:00
icmp.c net: icmp: introduce function icmpv6_param_prob_reason() 2022-04-13 13:09:57 +01:00
inet6_connection_sock.c lsm,selinux: pass flowi_common instead of flowi to the LSM hooks 2020-11-23 18:36:21 -05:00
inet6_hashtables.c ipv6: add READ_ONCE(sk->sk_bound_dev_if) in INET6_MATCH() 2022-05-16 10:31:06 +01:00
ioam6.c net: ipv6: Get rcv timestamp if needed when handling hop-by-hop IOAM option 2022-03-03 14:38:48 +00:00
ioam6_iptunnel.c ipv6: ioam: Insertion frequency in lwtunnel output 2022-02-04 20:24:45 -08:00
ip6_checksum.c
…
ip6_fib.c ipv6: annotate accesses to fn->fn_sernum 2022-01-20 20:18:37 -08:00
ip6_flowlabel.c ipv6: per-netns exclusive flowlabel checks 2022-02-16 20:37:47 -08:00
ip6_gre.c erspan: do not assume transport header is always set 2022-06-20 10:00:55 +01:00
ip6_icmp.c net: icmp: pass zeroed opts from icmp{,v6}_ndo_send before sending 2021-02-23 11:29:52 -08:00
ip6_input.c ipv6: fix NULL deref in ip6_rcv_core() 2022-04-15 14:05:18 -07:00
ip6_offload.c ipv6/gro: insert temporary HBH/jumbo header 2022-05-16 10:18:56 +01:00
ip6_offload.h
…
ip6_output.c ipv6: Fix signed integer overflow in __ip6_append_data 2022-06-08 10:56:43 -07:00
ip6_tunnel.c ip6_tunnel: Remove duplicate assignments 2022-04-06 15:31:15 +01:00
ip6_udp_tunnel.c net: Make locking in sock_bindtoindex optional 2020-06-01 14:57:14 -07:00
ip6_vti.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2021-12-30 12:12:12 -08:00
ip6mr.c net: ipv6mr: fix unused variable warning with CONFIG_IPV6_PIMSM_V2=n 2022-04-06 15:14:30 +01:00
ipcomp6.c xfrm: remove hdr_offset indirection 2021-06-11 14:48:50 +02:00
ipv6_sockglue.c ipv6: annotate some data-races around sk->sk_prot 2022-02-18 11:53:28 +00:00
mcast.c mld: respect RCU rules in ip6_mc_source() and ip6_mc_msfilter() 2022-04-30 15:19:08 +01:00
mcast_snoop.c net: bridge: mcast: fix broken length + header check for MRDv6 Adv. 2021-04-27 14:02:06 -07:00
mip6.c xfrm: ipv6: move mip6_rthdr_offset into xfrm core 2021-06-11 14:48:50 +02:00
ndisc.c net/ipv6: Expand and rename accept_unsolicited_na to accept_untracked_na 2022-05-31 11:36:57 +02:00
netfilter.c netfilter: Use l3mdev flow key when re-routing mangled packets 2022-05-16 13:03:29 +02:00
output_core.c ipv6: use prandom_u32() for ID generation 2021-05-31 22:12:08 -07:00
ping.c net: ping6: Fix ping -6 with interface name 2022-06-01 12:44:42 +02:00
proc.c net: udp: introduce UDP_MIB_MEMERRORS for udp_mem 2020-11-09 15:34:44 -08:00
protocol.c
…
raw.c net: SO_RCVMARK socket option for SO_MARK with recvmsg() 2022-04-28 13:08:15 -07:00
reassembly.c net: ipv6: Handle delivery_time in ipv6 defrag 2022-03-03 14:38:48 +00:00
route.c ipv6: take care of disable_policy when restoring routes 2022-06-27 22:24:30 -07:00
rpl.c net: ipv6: rpl*: Fix strange kerneldoc warnings due to bad header 2020-10-30 12:12:52 -07:00
rpl_iptunnel.c net: ipv6: rpl_iptunnel: simplify the return expression of rpl_do_srh() 2020-12-08 16:22:54 -08:00
seg6.c icmp: ICMPV6: Examine invoking packet for Segment Route Headers. 2022-01-04 12:17:35 +00:00
seg6_hmac.c net: ipv6: unexport __init-annotated seg6_hmac_net_init() 2022-06-28 21:23:30 -07:00
seg6_iptunnel.c seg6: fix the iif in the IPv6 socket control block 2021-12-09 07:55:42 -08:00
seg6_local.c net: seg6: fix seg6_lookup_any_nexthop() to handle VRFs using flowi_l3mdev 2022-06-09 22:04:47 -07:00
sit.c ipv6/sit: fix ipip6_tunnel_get_prl return value 2022-06-28 21:00:34 -07:00
syncookies.c tcp: make sure treq->af_specific is initialized 2022-04-25 12:10:11 +01:00
sysctl_net_ipv6.c net: sysctl: introduce sysctl SYSCTL_THREE 2022-05-03 10:15:06 +02:00
tcp_ipv6.c tcp_ipv6: set the drop_reason in the right place 2022-05-20 09:35:42 -07:00
tcpv6_offload.c net: move gro definitions to include/net/gro.h 2021-11-16 13:16:54 +00:00
tunnel6.c tunnel6: add tunnel6_input_afinfo for ipip and ipv6 tunnels 2020-07-09 12:52:37 +02:00
udp.c ipv6: add READ_ONCE(sk->sk_bound_dev_if) in INET6_MATCH() 2022-05-16 10:31:06 +01:00
udp_impl.h net: remove noblock parameter from recvmsg() entities 2022-04-12 15:00:25 +02:00
udp_offload.c gro: remove rcu_read_lock/rcu_read_unlock from gro_receive handlers 2021-11-24 17:21:42 -08:00
udplite.c net/ipv6: remove compat_ipv6_{get,set}sockopt 2020-07-19 18:16:41 -07:00
xfrm6_input.c xfrm: state: remove extract_input indirection from xfrm_state_afinfo 2020-05-06 09:40:08 +02:00
xfrm6_output.c xfrm: fix tunnel model fragmentation behavior 2022-03-01 12:08:40 +01:00
xfrm6_policy.c net: Add l3mdev index to flow struct and avoid oif reset for port devices 2022-03-15 20:20:02 -07:00
xfrm6_protocol.c xfrm: add support for UDPv6 encapsulation of ESP 2020-04-28 11:28:36 +02:00
xfrm6_state.c xfrm: remove output_finish indirection from xfrm_state_afinfo 2020-05-06 09:40:08 +02:00
xfrm6_tunnel.c xfrm: remove description from xfrm_type struct 2021-06-09 09:38:52 +02:00