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Eric Dumazet aa05cb4c9b ip6_tunnel: fix NEXTHDR_FRAGMENT handling in ip6_tnl_parse_tlv_enc_lim() 
[ Upstream commit d375b98e0248980681e5e56b712026174d617198 ]

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: fbfa743a9d2a ("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>
2024-11-18 12:12:38 +01:00
..
ila Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
netfilter Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
addrconf.c net: ipv6: support reporting otherwise unknown prefix flags in RTM_NEWPREFIX 2024-11-18 12:11:48 +01:00
addrconf_core.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
addrlabel.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
af_inet6.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
ah6.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
anycast.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
calipso.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
datagram.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
esp6.c net: ipv6: fix return value check in esp_remove_trailer 2024-11-08 11:26:10 +01:00
esp6_offload.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
exthdrs.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
exthdrs_core.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
exthdrs_offload.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
fib6_notifier.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
fib6_rules.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
fou6.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
icmp.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
inet6_connection_sock.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
inet6_hashtables.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
ip6_checksum.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
ip6_fib.c ipv6: fix potential NULL deref in fib6_add() 2024-11-18 12:11:38 +01:00
ip6_flowlabel.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
ip6_gre.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
ip6_icmp.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
ip6_input.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
ip6_offload.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
ip6_offload.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
ip6_output.c ipv6: avoid atomic fragment on GSO packets 2024-11-18 11:42:50 +01:00
ip6_tunnel.c ip6_tunnel: fix NEXTHDR_FRAGMENT handling in ip6_tnl_parse_tlv_enc_lim() 2024-11-18 12:12:38 +01:00
ip6_udp_tunnel.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
ip6_vti.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
ip6mr.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
ipcomp6.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
ipv6_sockglue.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
Kconfig Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
Makefile Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
mcast.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
mcast_snoop.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
mip6.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
ndisc.c net: change accept_ra_min_rtr_lft to affect all RA lifetimes 2024-11-08 11:25:47 +01:00
netfilter.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
output_core.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
ping.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
proc.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
protocol.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
raw.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
reassembly.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
route.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
rpl.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
rpl_iptunnel.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
seg6.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
seg6_hmac.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
seg6_iptunnel.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
seg6_local.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
sit.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
syncookies.c dccp/tcp: Call security_inet_conn_request() after setting IPv6 addresses. 2024-11-18 11:43:07 +01:00
sysctl_net_ipv6.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
tcp_ipv6.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
tcpv6_offload.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
tunnel6.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
udp.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
udp_impl.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
udp_offload.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
udplite.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
xfrm6_input.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
xfrm6_output.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
xfrm6_policy.c Revert "xfrm6: fix inet6_dev refcount underflow problem" 2024-11-17 19:38:30 +01:00
xfrm6_protocol.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
xfrm6_state.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
xfrm6_tunnel.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00