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Eric Dumazet 687c5d52fe ip6_tunnel: fix NEXTHDR_FRAGMENT handling in ip6_tnl_parse_tlv_enc_lim() 
[ Upstream commit d375b98e02 ]

syzbot pointed out [1] that NEXTHDR_FRAGMENT handling is broken.

Reading frag_off can only be done if we pulled enough bytes
to skb->head. Currently we might access garbage.

[1]
BUG: KMSAN: uninit-value in ip6_tnl_parse_tlv_enc_lim+0x94f/0xbb0
ip6_tnl_parse_tlv_enc_lim+0x94f/0xbb0
ipxip6_tnl_xmit net/ipv6/ip6_tunnel.c:1326 [inline]
ip6_tnl_start_xmit+0xab2/0x1a70 net/ipv6/ip6_tunnel.c:1432
__netdev_start_xmit include/linux/netdevice.h:4940 [inline]
netdev_start_xmit include/linux/netdevice.h:4954 [inline]
xmit_one net/core/dev.c:3548 [inline]
dev_hard_start_xmit+0x247/0xa10 net/core/dev.c:3564
__dev_queue_xmit+0x33b8/0x5130 net/core/dev.c:4349
dev_queue_xmit include/linux/netdevice.h:3134 [inline]
neigh_connected_output+0x569/0x660 net/core/neighbour.c:1592
neigh_output include/net/neighbour.h:542 [inline]
ip6_finish_output2+0x23a9/0x2b30 net/ipv6/ip6_output.c:137
ip6_finish_output+0x855/0x12b0 net/ipv6/ip6_output.c:222
NF_HOOK_COND include/linux/netfilter.h:303 [inline]
ip6_output+0x323/0x610 net/ipv6/ip6_output.c:243
dst_output include/net/dst.h:451 [inline]
ip6_local_out+0xe9/0x140 net/ipv6/output_core.c:155
ip6_send_skb net/ipv6/ip6_output.c:1952 [inline]
ip6_push_pending_frames+0x1f9/0x560 net/ipv6/ip6_output.c:1972
rawv6_push_pending_frames+0xbe8/0xdf0 net/ipv6/raw.c:582
rawv6_sendmsg+0x2b66/0x2e70 net/ipv6/raw.c:920
inet_sendmsg+0x105/0x190 net/ipv4/af_inet.c:847
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg net/socket.c:745 [inline]
____sys_sendmsg+0x9c2/0xd60 net/socket.c:2584
___sys_sendmsg+0x28d/0x3c0 net/socket.c:2638
__sys_sendmsg net/socket.c:2667 [inline]
__do_sys_sendmsg net/socket.c:2676 [inline]
__se_sys_sendmsg net/socket.c:2674 [inline]
__x64_sys_sendmsg+0x307/0x490 net/socket.c:2674
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0x44/0x110 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x63/0x6b

Uninit was created at:
slab_post_alloc_hook+0x129/0xa70 mm/slab.h:768
slab_alloc_node mm/slub.c:3478 [inline]
__kmem_cache_alloc_node+0x5c9/0x970 mm/slub.c:3517
__do_kmalloc_node mm/slab_common.c:1006 [inline]
__kmalloc_node_track_caller+0x118/0x3c0 mm/slab_common.c:1027
kmalloc_reserve+0x249/0x4a0 net/core/skbuff.c:582
pskb_expand_head+0x226/0x1a00 net/core/skbuff.c:2098
__pskb_pull_tail+0x13b/0x2310 net/core/skbuff.c:2655
pskb_may_pull_reason include/linux/skbuff.h:2673 [inline]
pskb_may_pull include/linux/skbuff.h:2681 [inline]
ip6_tnl_parse_tlv_enc_lim+0x901/0xbb0 net/ipv6/ip6_tunnel.c:408
ipxip6_tnl_xmit net/ipv6/ip6_tunnel.c:1326 [inline]
ip6_tnl_start_xmit+0xab2/0x1a70 net/ipv6/ip6_tunnel.c:1432
__netdev_start_xmit include/linux/netdevice.h:4940 [inline]
netdev_start_xmit include/linux/netdevice.h:4954 [inline]
xmit_one net/core/dev.c:3548 [inline]
dev_hard_start_xmit+0x247/0xa10 net/core/dev.c:3564
__dev_queue_xmit+0x33b8/0x5130 net/core/dev.c:4349
dev_queue_xmit include/linux/netdevice.h:3134 [inline]
neigh_connected_output+0x569/0x660 net/core/neighbour.c:1592
neigh_output include/net/neighbour.h:542 [inline]
ip6_finish_output2+0x23a9/0x2b30 net/ipv6/ip6_output.c:137
ip6_finish_output+0x855/0x12b0 net/ipv6/ip6_output.c:222
NF_HOOK_COND include/linux/netfilter.h:303 [inline]
ip6_output+0x323/0x610 net/ipv6/ip6_output.c:243
dst_output include/net/dst.h:451 [inline]
ip6_local_out+0xe9/0x140 net/ipv6/output_core.c:155
ip6_send_skb net/ipv6/ip6_output.c:1952 [inline]
ip6_push_pending_frames+0x1f9/0x560 net/ipv6/ip6_output.c:1972
rawv6_push_pending_frames+0xbe8/0xdf0 net/ipv6/raw.c:582
rawv6_sendmsg+0x2b66/0x2e70 net/ipv6/raw.c:920
inet_sendmsg+0x105/0x190 net/ipv4/af_inet.c:847
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg net/socket.c:745 [inline]
____sys_sendmsg+0x9c2/0xd60 net/socket.c:2584
___sys_sendmsg+0x28d/0x3c0 net/socket.c:2638
__sys_sendmsg net/socket.c:2667 [inline]
__do_sys_sendmsg net/socket.c:2676 [inline]
__se_sys_sendmsg net/socket.c:2674 [inline]
__x64_sys_sendmsg+0x307/0x490 net/socket.c:2674
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0x44/0x110 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x63/0x6b

CPU: 0 PID: 7345 Comm: syz-executor.3 Not tainted 6.7.0-rc8-syzkaller-00024-gac865f00af29 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023

Fixes: fbfa743a9d ("ipv6: fix ip6_tnl_parse_tlv_enc_lim()")
Reported-by: syzbot <syzkaller@googlegroups.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Willem de Bruijn <willemb@google.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2024-01-25 15:35:30 -08:00
..
6lowpan
9p net: 9p: avoid freeing uninit memory in p9pdu_vreadf 2024-01-01 12:42:41 +00:00
802
8021q net: check vlan filter feature in vlan_vids_add_by_dev() and vlan_vids_del_by_dev() 2024-01-01 12:42:32 +00:00
appletalk appletalk: Fix Use-After-Free in atalk_ioctl 2023-12-20 17:01:50 +01:00
atm atm: Fix Use-After-Free in do_vcc_ioctl 2023-12-20 17:01:48 +01:00
ax25 ax25: Kconfig: Update link for linux-ax25.org 2023-09-18 12:56:58 +01:00
batman-adv Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2023-08-24 10:51:39 -07:00
bluetooth Bluetooth: Fix bogus check for re-auth no supported with non-ssp 2024-01-25 15:35:29 -08:00
bpf bpf: Prevent inlining of bpf_fentry_test7() 2023-08-30 08:36:17 +02:00
bpfilter
bridge netfilter: nf_conntrack_bridge: initialize err to 0 2023-11-28 17:19:52 +00:00
caif
can can: isotp: isotp_sendmsg(): fix TX state detection and wait behavior 2023-10-06 12:54:33 +02:00
ceph libceph: use kernel_connect() 2023-10-09 13:35:24 +02:00
core neighbour: Don't let neigh_forced_gc() disable preemption for long 2024-01-20 11:51:43 +01:00
dcb net: dcb: choose correct policy to parse DCB_ATTR_BCN 2023-08-01 21:07:46 -07:00
dccp dccp/tcp: Call security_inet_conn_request() after setting IPv6 addresses. 2023-11-20 11:59:35 +01:00
devlink devlink: Hold devlink lock on health reporter dump get 2023-10-06 15:56:46 -07:00
dns_resolver keys, dns: Fix missing size check of V1 server-list header 2024-01-10 17:16:45 +01:00
dsa net: dsa: mark parsed interface mode for legacy switch drivers 2023-08-09 13:08:09 -07:00
ethernet
ethtool ethtool: don't propagate EOPNOTSUPP from dumps 2023-12-08 08:52:23 +01:00
handshake net/handshake: fix file ref count in handshake_nl_accept_doit() 2023-10-23 10:19:33 -07:00
hsr hsr: Prevent use after free in prp_create_tagged_frame() 2023-11-20 11:59:34 +01:00
ieee802154 sysctl-6.6-rc1 2023-08-29 17:39:15 -07:00
ife net: sched: ife: fix potential use-after-free 2024-01-01 12:42:30 +00:00
ipv4 sctp: support MSG_ERRQUEUE flag in recvmsg() 2024-01-25 15:35:30 -08:00
ipv6 ip6_tunnel: fix NEXTHDR_FRAGMENT handling in ip6_tnl_parse_tlv_enc_lim() 2024-01-25 15:35:30 -08:00
iucv
kcm kcm: Fix error handling for SOCK_DGRAM in kcm_sendmsg(). 2023-09-14 10:43:51 +02:00
key Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2023-08-18 12:44:56 -07:00
l2tp udp: annotate data-races around udp->encap_type 2023-11-20 11:58:56 +01:00
l3mdev
lapb
llc llc: verify mac len before reading mac header 2023-11-20 11:59:34 +01:00
mac80211 wifi: mac80211: handle 320 MHz in ieee80211_ht_cap_ie_to_sta_ht_cap 2024-01-20 11:51:37 +01:00
mac802154
mctp mctp: perform route lookups under a RCU read-side lock 2023-10-10 19:43:22 -07:00
mpls networking: Update to register_net_sysctl_sz 2023-08-15 15:26:18 -07:00
mptcp mptcp: fix uninit-value in mptcp_incoming_options 2024-01-20 11:51:37 +01:00
ncsi net/ncsi: Fix netlink major/minor version numbers 2024-01-25 15:35:20 -08:00
netfilter netfilter: nf_tables: validate chain type update if available 2024-01-25 15:35:29 -08:00
netlabel calipso: fix memory leak in netlbl_calipso_add_pass() 2024-01-25 15:35:14 -08:00
netlink drop_monitor: Require 'CAP_SYS_ADMIN' when joining "events" group 2023-12-13 18:45:10 +01:00
netrom netrom: Deny concurrent connect(). 2023-08-28 06:58:46 +01:00
nfc nfc: Do not send datagram if socket state isn't LLCP_BOUND 2024-01-20 11:51:46 +01:00
nsh
openvswitch net/sched: act_ct: Always fill offloading tuple iifidx 2023-11-20 11:59:37 +01:00
packet packet: Move reference count in packet_sock to atomic_long_t 2023-12-13 18:45:23 +01:00
phonet
psample psample: Require 'CAP_NET_ADMIN' when joining "packets" group 2023-12-13 18:45:10 +01:00
qrtr net: qrtr: ns: Return 0 if server port is not present 2024-01-20 11:51:47 +01:00
rds net: prevent address rewrite in kernel_bind() 2023-10-01 19:31:29 +01:00
rfkill net: rfkill: gpio: set GPIO direction 2024-01-01 12:42:41 +00:00
rose net/rose: fix races in rose_kill_by_device() 2024-01-01 12:42:31 +00:00
rxrpc rxrpc: Fix skbuff cleanup of call's recvmsg_queue and rx_oos_queue 2024-01-25 15:35:30 -08:00
sched net/sched: act_ct: fix skb leak and crash on ooo frags 2024-01-25 15:35:30 -08:00
sctp sctp: fix busy polling 2024-01-25 15:35:30 -08:00
smc net/smc: fix invalid link access in dumping SMC-R connections 2024-01-10 17:16:52 +01:00
strparser
sunrpc SUNRPC: fix _xprt_switch_find_current_entry logic 2024-01-25 15:35:18 -08:00
switchdev net: switchdev: Add a helper to replay objects on a bridge port 2023-07-21 08:54:03 +01:00
tipc tipc: Fix kernel-infoleak due to uninitialized TLV value 2023-11-28 17:19:51 +00:00
tls net: tls, update curr on splice as well 2023-12-13 18:45:10 +01:00
unix bpf: sockmap, fix proto update hook to avoid dup calls 2024-01-25 15:35:30 -08:00
vmw_vsock virtio/vsock: send credit update during setting SO_RCVLOWAT 2024-01-25 15:35:26 -08:00
wireless wifi: cfg80211: parse all ML elements in an ML probe response 2024-01-25 15:35:30 -08:00
x25
xdp xsk: add multi-buffer support for sockets sharing umem 2024-01-10 17:16:54 +01:00
xfrm ipsec-2023-10-17 2023-10-17 18:21:13 -07:00
compat.c
devres.c
Kconfig bpf: Add fd-based tcx multi-prog infra with link support 2023-07-19 10:07:27 -07:00
Kconfig.debug
Makefile
socket.c net: Save and restore msg_namelen in sock_sendmsg 2024-01-10 17:16:51 +01:00
sysctl_net.c sysctl: Add size to register_net_sysctl function 2023-08-15 15:26:17 -07:00