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55f7eb4001
linux/net
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Eric Dumazet 55f7eb4001 ipv6: prevent NULL dereference in ip6_output() 
[ Upstream commit 4db783d68b ]

According to syzbot, there is a chance that ip6_dst_idev()
returns NULL in ip6_output(). Most places in IPv6 stack
deal with a NULL idev just fine, but not here.

syzbot reported:

general protection fault, probably for non-canonical address 0xdffffc00000000bc: 0000 [#1] PREEMPT SMP KASAN PTI
KASAN: null-ptr-deref in range [0x00000000000005e0-0x00000000000005e7]
CPU: 0 PID: 9775 Comm: syz-executor.4 Not tainted 6.9.0-rc5-syzkaller-00157-g6a30653b604a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
 RIP: 0010:ip6_output+0x231/0x3f0 net/ipv6/ip6_output.c:237
Code: 3c 1e 00 49 89 df 74 08 4c 89 ef e8 19 58 db f7 48 8b 44 24 20 49 89 45 00 49 89 c5 48 8d 9d e0 05 00 00 48 89 d8 48 c1 e8 03 <42> 0f b6 04 38 84 c0 4c 8b 74 24 28 0f 85 61 01 00 00 8b 1b 31 ff
RSP: 0018:ffffc9000927f0d8 EFLAGS: 00010202
RAX: 00000000000000bc RBX: 00000000000005e0 RCX: 0000000000040000
RDX: ffffc900131f9000 RSI: 0000000000004f47 RDI: 0000000000004f48
RBP: 0000000000000000 R08: ffffffff8a1f0b9a R09: 1ffffffff1f51fad
R10: dffffc0000000000 R11: fffffbfff1f51fae R12: ffff8880293ec8c0
R13: ffff88805d7fc000 R14: 1ffff1100527d91a R15: dffffc0000000000
FS:  00007f135c6856c0(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000080 CR3: 0000000064096000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
  NF_HOOK include/linux/netfilter.h:314 [inline]
  ip6_xmit+0xefe/0x17f0 net/ipv6/ip6_output.c:358
  sctp_v6_xmit+0x9f2/0x13f0 net/sctp/ipv6.c:248
  sctp_packet_transmit+0x26ad/0x2ca0 net/sctp/output.c:653
  sctp_packet_singleton+0x22c/0x320 net/sctp/outqueue.c:783
  sctp_outq_flush_ctrl net/sctp/outqueue.c:914 [inline]
  sctp_outq_flush+0x6d5/0x3e20 net/sctp/outqueue.c:1212
  sctp_side_effects net/sctp/sm_sideeffect.c:1198 [inline]
  sctp_do_sm+0x59cc/0x60c0 net/sctp/sm_sideeffect.c:1169
  sctp_primitive_ASSOCIATE+0x95/0xc0 net/sctp/primitive.c:73
  __sctp_connect+0x9cd/0xe30 net/sctp/socket.c:1234
  sctp_connect net/sctp/socket.c:4819 [inline]
  sctp_inet_connect+0x149/0x1f0 net/sctp/socket.c:4834
  __sys_connect_file net/socket.c:2048 [inline]
  __sys_connect+0x2df/0x310 net/socket.c:2065
  __do_sys_connect net/socket.c:2075 [inline]
  __se_sys_connect net/socket.c:2072 [inline]
  __x64_sys_connect+0x7a/0x90 net/socket.c:2072
  do_syscall_x64 arch/x86/entry/common.c:52 [inline]
  do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Fixes: 778d80be52 ("ipv6: Add disable_ipv6 sysctl to disable IPv6 operaion on specific interface.")
Reported-by: syzbot <syzkaller@googlegroups.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Larysa Zaremba <larysa.zaremba@intel.com>
Link: https://lore.kernel.org/r/20240507161842.773961-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2024-05-17 12:14:55 +02:00
..
6lowpan net: fill in MODULE_DESCRIPTION()s for 6LoWPAN 2024-02-09 14:12:01 -08:00
9p 9p: Fix read/write debug statements to report server reply 2024-04-10 16:38:09 +02:00
802 net: fill in MODULE_DESCRIPTION()s under net/802* 2023-10-28 11:29:28 +01:00
8021q net: gro: fix udp bad offset in socket lookup by adding {inner_}network_offset to napi_gro_cb 2024-05-17 12:14:34 +02:00
appletalk net: remove SOCK_DEBUG leftovers 2023-12-26 20:31:01 +00:00
atm net: fill in MODULE_DESCRIPTION()s for mpoa 2024-02-09 14:12:01 -08:00
ax25 ax25: Fix netdev refcount issue 2024-05-02 16:35:16 +02:00
batman-adv batman-adv: Avoid infinite loop trying to resize local TT 2024-04-17 11:23:24 +02:00
bluetooth Bluetooth: l2cap: fix null-ptr-deref in l2cap_chan_timeout 2024-05-17 12:14:52 +02:00
bpf bpf: Fix dtor CFI 2023-12-15 16:25:55 -08:00
bridge net-sysfs: convert dev->operstate reads to lockless ones 2024-05-17 12:14:54 +02:00
caif net: fill in MODULE_DESCRIPTION()s for CAIF 2024-01-05 08:06:35 -08:00
can can: j1939: Fix UAF in j1939_sk_match_filter during setsockopt(SO_J1939_FILTER) 2024-02-14 13:53:03 +01:00
ceph libceph: init the cursor when preparing sparse read in msgr2 2024-03-06 12:43:01 +01:00
core net-sysfs: convert dev->operstate reads to lockless ones 2024-05-17 12:14:54 +02:00
dcb
dccp net: remove SOCK_DEBUG leftovers 2023-12-26 20:31:01 +00:00
devlink devlink: fix port new reply cmd type 2024-03-26 18:17:36 -04:00
dns_resolver Networking changes for 6.8. 2024-01-11 10:07:29 -08:00
dsa net: dsa: fix netdev_priv() dereference before check on non-DSA netdevice events 2024-01-11 16:33:52 -08:00
ethernet ethernet: Add helper for assigning packet type when dest address does not match device address 2024-05-02 16:35:30 +02:00
ethtool ethtool: netlink: Add missing ethnl_ops_begin/complete 2024-01-18 13:21:06 +01:00
handshake net/handshake: Fix handshake_req_destroy_test1 2024-02-08 18:32:29 -08:00
hsr hsr: Simplify code for announcing HSR nodes timer setup 2024-05-17 12:14:54 +02:00
ieee802154 mac802154: Avoid new associations while disassociating 2023-12-15 11:14:57 +01:00
ife net: sched: ife: fix potential use-after-free 2023-12-15 10:50:18 +00:00
ipv4 tcp: Use refcount_inc_not_zero() in tcp_twsk_unique(). 2024-05-17 12:14:51 +02:00
ipv6 ipv6: prevent NULL dereference in ip6_output() 2024-05-17 12:14:55 +02:00
iucv net/iucv: fix the allocation size of iucv_path_table array 2024-02-16 09:25:09 +00:00
kcm net: kcm: fix incorrect parameter validation in the kcm_getsockopt) function 2024-03-26 18:16:57 -04:00
key net: fill in MODULE_DESCRIPTION()s for af_key 2024-02-09 14:12:01 -08:00
l2tp net l2tp: drop flow hash on forward 2024-05-17 12:14:29 +02:00
l3mdev
lapb
llc llc: call sock_orphan() at release time 2024-01-30 13:49:09 +01:00
mac80211 wifi: mac80211: fix prep_connection error path 2024-05-17 12:14:38 +02:00
mac802154 mac802154: fix llsec key resources release in mac802154_llsec_key_del 2024-04-03 15:32:15 +02:00
mctp net: mctp: copy skb ext data when fragmenting 2024-03-26 18:16:49 -04:00
mpls net: mpls: error out if inner headers are not set 2024-04-13 13:10:12 +02:00
mptcp mptcp: don't account accept() of non-MPC client as fallback to TCP 2024-04-10 16:38:09 +02:00
ncsi net/ncsi: Add NC-SI 1.2 Get MC MAC Address command 2023-11-18 15:00:51 +00:00
netfilter netfilter: nf_tables: honor table dormant flag from netdev release event path 2024-05-02 16:35:21 +02:00
netlabel calipso: fix memory leak in netlbl_calipso_add_pass() 2023-12-07 14:23:12 -05:00
netlink netlink: Fix kernel-infoleak-after-free in __skb_datagram_iter 2024-02-22 18:56:09 -08:00
netrom netrom: Fix data-races around sysctl_net_busy_read 2024-03-07 10:36:58 +01:00
nfc nfc: nci: Fix kcov check in nci_rx_work() 2024-05-17 12:14:53 +02:00
nsh nsh: Restore skb->{protocol,data,mac_header} for outer header in nsh_gso_segment(). 2024-05-17 12:14:29 +02:00
openvswitch net: openvswitch: Fix Use-After-Free in ovs_ct_exit 2024-05-02 16:35:20 +02:00
packet packet: annotate data-races around ignore_outgoing 2024-03-26 18:17:34 -04:00
phonet phonet: fix rtm_phonet_notify() skb allocation 2024-05-17 12:14:53 +02:00
psample genetlink: Use internal flags for multicast groups 2023-12-29 08:43:59 +00:00
qrtr net: qrtr: ns: Return 0 if server port is not present 2024-01-01 18:41:29 +00:00
rds net/rds: fix possible cp null dereference 2024-04-10 16:38:02 +02:00
rfkill Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2023-12-21 22:17:23 +01:00
rose net/rose: fix races in rose_kill_by_device() 2023-12-15 11:59:53 +00:00
rxrpc rxrpc: Only transmit one ACK per jumbo packet received 2024-05-17 12:14:54 +02:00
sched net/sched: Fix mirred deadlock on device recursion 2024-04-27 17:12:53 +02:00
sctp net: sctp: fix skb leak in sctp_inq_free() 2024-02-15 07:34:52 -08:00
smc net/smc: reduce rtnl pressure in smc_pnet_create_pnetids_list() 2024-04-13 13:10:02 +02:00
strparser
sunrpc SUNRPC: add a missing rpc_stat for TCP TLS 2024-05-17 12:14:50 +02:00
switchdev net: bridge: switchdev: Skip MDB replays of deferred events on offload 2024-02-16 09:36:37 +00:00
tipc tipc: fix a possible memleak in tipc_buf_append 2024-05-17 12:14:33 +02:00
tls tls: fix lockless read of strp->msg_ready in ->poll 2024-05-02 16:35:22 +02:00
unix af_unix: Suppress false-positive lockdep splat for spin_lock() in __unix_gc(). 2024-05-02 16:35:23 +02:00
vmw_vsock vsock/virtio: fix packet delivery to tap device 2024-04-10 16:38:03 +02:00
wireless wifi: cfg80211: fix rdev_dump_mpp() arguments order 2024-05-17 12:14:37 +02:00
x25 net/x25: fix incorrect parameter validation in the x25_getsockopt() function 2024-03-26 18:16:57 -04:00
xdp xsk: validate user input for XDP_{UMEM|COMPLETION}_FILL_RING 2024-04-17 11:23:28 +02:00
xfrm xfrm: Preserve vlan tags for transport mode software GRO 2024-05-17 12:14:51 +02:00
compat.c file: stop exposing receive_fd_user() 2023-12-12 14:24:14 +01:00
devres.c
Kconfig bpfilter: remove bpfilter 2024-01-04 10:23:10 -08:00
Kconfig.debug
Makefile bpfilter: remove bpfilter 2024-01-04 10:23:10 -08:00
socket.c vfs-6.8.iov_iter 2024-01-08 11:43:04 -08:00
sysctl_net.c