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linux/net
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Eric Dumazet 09ff062b89 ipv6: reject malicious packets in ipv6_gso_segment() 
[ Upstream commit d45cf1e7d7 ]

syzbot was able to craft a packet with very long IPv6 extension headers
leading to an overflow of skb->transport_header.

This 16bit field has a limited range.

Add skb_reset_transport_header_careful() helper and use it
from ipv6_gso_segment()

WARNING: CPU: 0 PID: 5871 at ./include/linux/skbuff.h:3032 skb_reset_transport_header include/linux/skbuff.h:3032 [inline]
WARNING: CPU: 0 PID: 5871 at ./include/linux/skbuff.h:3032 ipv6_gso_segment+0x15e2/0x21e0 net/ipv6/ip6_offload.c:151
Modules linked in:
CPU: 0 UID: 0 PID: 5871 Comm: syz-executor211 Not tainted 6.16.0-rc6-syzkaller-g7abc678e3084 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
 RIP: 0010:skb_reset_transport_header include/linux/skbuff.h:3032 [inline]
 RIP: 0010:ipv6_gso_segment+0x15e2/0x21e0 net/ipv6/ip6_offload.c:151
Call Trace:
 <TASK>
  skb_mac_gso_segment+0x31c/0x640 net/core/gso.c:53
  nsh_gso_segment+0x54a/0xe10 net/nsh/nsh.c:110
  skb_mac_gso_segment+0x31c/0x640 net/core/gso.c:53
  __skb_gso_segment+0x342/0x510 net/core/gso.c:124
  skb_gso_segment include/net/gso.h:83 [inline]
  validate_xmit_skb+0x857/0x11b0 net/core/dev.c:3950
  validate_xmit_skb_list+0x84/0x120 net/core/dev.c:4000
  sch_direct_xmit+0xd3/0x4b0 net/sched/sch_generic.c:329
  __dev_xmit_skb net/core/dev.c:4102 [inline]
  __dev_queue_xmit+0x17b6/0x3a70 net/core/dev.c:4679

Fixes: d1da932ed4 ("ipv6: Separate ipv6 offload support")
Reported-by: syzbot+af43e647fd835acc02df@syzkaller.appspotmail.com
Closes: https://lore.kernel.org/netdev/688a1a05.050a0220.5d226.0008.GAE@google.com/T/#u
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Dawid Osuchowski <dawid.osuchowski@linux.intel.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Link: https://patch.msgid.link/20250730131738.3385939-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2025-08-28 16:24:13 +02:00
..
6lowpan 6lowpan: iphc: Fix an off-by-one check of array index 2021-07-22 16:19:03 +02:00
9p 9p/xen: fix release of IRQ 2024-12-14 19:51:21 +01:00
802 net: 802: LLC+SNAP OID:PID lookup on start of skb data 2025-01-23 17:15:49 +01:00
8021q net: vlan: fix VLAN 0 refcount imbalance of toggling filtering during runtime 2025-08-28 16:24:02 +02:00
appletalk net: appletalk: Fix use-after-free in AARP proxy probe 2025-08-28 16:24:04 +02:00
atm atm: clip: Fix NULL pointer dereference in vcc_sendmsg() 2025-07-17 18:30:47 +02:00
ax25 net: ax25: Fix deadlock caused by skb_recv_datagram in ax25_recvmsg 2022-06-22 14:22:01 +02:00
batman-adv batman-adv: Ignore own maximum aggregation size during RX 2025-04-10 14:31:55 +02:00
bluetooth Bluetooth: L2CAP: Fix attempting to adjust outgoing MTU 2025-08-28 16:24:02 +02:00
bpf bpf: Set run context for rawtp test_run callback 2024-07-05 09:14:06 +02:00
bpfilter bpfilter: Specify the log level for the kmsg message 2021-06-25 13:13:50 +02:00
bridge net: bridge: Do not offload IGMP/MLD messages 2025-08-28 16:24:02 +02:00
caif caif: reduce stack size, again 2025-08-28 16:24:07 +02:00
can can: bcm: add missing rcu read protection for procfs content 2025-06-04 14:38:06 +02:00
ceph libceph: fix race between delayed_work() and ceph_monc_stop() 2024-07-18 13:07:42 +02:00
core netpoll: prevent hanging NAPI when netcons gets enabled 2025-08-28 16:24:13 +02:00
dcb net: dcb: choose correct policy to parse DCB_ATTR_BCN 2023-08-11 15:13:53 +02:00
dccp net: fix data-races around sk->sk_forward_alloc 2025-01-23 17:16:04 +01:00
dns_resolver keys, dns: Fix size check of V1 server-list header 2024-01-25 14:52:46 -08:00
dsa net: dsa: tag_brcm: legacy: fix pskb_may_pull length 2025-06-27 11:05:17 +01:00
ethernet gro: remove rcu_read_lock/rcu_read_unlock from gro_complete handlers 2024-09-12 11:07:47 +02:00
ethtool net: ethtool: Don't call .cleanup_data when prepare_data fails 2025-05-02 07:43:52 +02:00
hsr net: hsr: fix fill_frame_info() regression vs VLAN packets 2025-03-13 12:50:13 +01:00
ieee802154 net: ieee802154: do not leave a dangling sk pointer in ieee802154_create() 2024-12-14 19:51:37 +01:00
ife net: sched: ife: fix potential use-after-free 2024-01-05 15:13:29 +01:00
ipv4 tcp: fix tcp_ofo_queue() to avoid including too much DUP SACK range 2025-08-28 16:24:07 +02:00
ipv6 ipv6: reject malicious packets in ipv6_gso_segment() 2025-08-28 16:24:13 +02:00
iucv s390/iucv: fix receive buffer virtual vs physical address confusion 2024-09-04 13:23:27 +02:00
kcm kcm: Serialise kcm_sendmsg() for the same socket. 2024-09-04 13:23:32 +02:00
key net: af_key: fix sadb_x_filter validation 2023-08-26 14:23:32 +02:00
l2tp genetlink: hold RCU in genlmsg_mcast() 2024-11-01 01:52:34 +01:00
l3mdev net: Add l3mdev index to flow struct and avoid oif reset for port devices 2024-10-17 15:11:57 +02:00
lapb net: lapb: Use list_for_each_entry() to simplify code in lapb_iface.c 2021-06-08 16:31:25 -07:00
llc llc: fix data loss when reading from a socket in llc_ui_recvmsg() 2025-06-04 14:38:06 +02:00
mac80211 Reapply "wifi: mac80211: Update skb's control block key in ieee80211_tx_dequeue()" 2025-08-28 16:24:08 +02:00
mac802154 mac802154: check local interfaces before deleting sdata list 2025-01-23 17:16:00 +01:00
mctp net: mctp: Set SOCK_RCU_FREE 2025-05-02 07:44:10 +02:00
mpls mpls: Use rcu_dereference_rtnl() in mpls_route_input_rcu(). 2025-06-27 11:05:36 +01:00
mptcp net: make sock_inuse_add() available 2025-05-02 07:44:20 +02:00
ncsi net: ncsi: Fix GCPS 64-bit member variables 2025-06-27 11:05:12 +01:00
netfilter netfilter: xt_nfacct: don't assume acct name is null-terminated 2025-08-28 16:24:09 +02:00
netlabel calipso: unlock rcu before returning -EAFNOSUPPORT 2025-06-27 11:05:22 +01:00
netlink netlink: make sure we allow at least one dump skb 2025-07-17 18:30:50 +02:00
netrom netrom: check buffer length before accessing it 2025-01-09 13:28:46 +01:00
nfc NFC: nci: uart: Set tty->disc_data only in success path 2025-06-27 11:05:25 +01:00
nsh nsh: Restore skb->{protocol,data,mac_header} for outer header in nsh_gso_segment(). 2024-05-17 11:50:48 +02:00
openvswitch net: openvswitch: Fix the dead loop of MPLS parse 2025-06-27 11:05:14 +01:00
packet af_packet: fix soft lockup issue caused by tpacket_snd() 2025-08-28 16:23:59 +02:00
phonet phonet/pep: Move call to pn_skb_get_dst_sockaddr() earlier in pep_sock_accept() 2025-08-28 16:23:59 +02:00
psample psample: Require 'CAP_NET_ADMIN' when joining "packets" group 2023-12-13 18:36:37 +01:00
qrtr net: qrtr: Update packets cloning when broadcasting 2024-10-17 15:11:08 +02:00
rds net:rds: Fix possible deadlock in rds_message_put 2024-09-04 13:23:39 +02:00
rfkill net: rfkill: gpio: Add check for clk_enable() 2024-12-14 19:50:58 +01:00
rose rose: fix dangling neighbour pointers in rose_rt_device_down() 2025-07-10 15:57:46 +02:00
rxrpc rxrpc: Fix oops due to non-existence of prealloc backlog struct 2025-07-17 18:30:48 +02:00
sched net_sched: act_ctinfo: use atomic64_t for three counters 2025-08-28 16:24:08 +02:00
sctp sctp: Do not wake readers in __sctp_write_space() 2025-06-27 11:05:31 +01:00
smc net/smc: fix data error when recvmsg with MSG_PEEK flag 2025-03-13 12:49:57 +01:00
strparser bpf: sockmap, strparser, and tls are reusing qdisc_skb_cb and colliding 2021-11-18 19:17:11 +01:00
sunrpc sunrpc: fix race in cache cleanup causing stale nextcheck time 2025-06-27 11:05:29 +01:00
switchdev net: make switchdev_bridge_port_{,unoffload} loosely coupled with the bridge 2021-08-04 12:35:07 +01:00
tipc tipc: Fix use-after-free in tipc_conn_close(). 2025-07-17 18:30:46 +02:00
tls bpf, ktls: Fix data corruption when using bpf_msg_pop_data() in ktls 2025-08-28 16:24:07 +02:00
unix af_unix: Don't set -ECONNRESET for consumed OOB skb. 2025-07-10 15:57:38 +02:00
vmw_vsock vsock: Fix IOCTL_VM_SOCKETS_GET_LOCAL_CID to check also transport_local 2025-07-17 18:30:46 +02:00
wireless wifi: nl80211: reject cooked mode if it is set along with other flags 2025-03-13 12:51:03 +01:00
x25 net/x25: fix incorrect parameter validation in the x25_getsockopt() function 2024-03-26 18:21:23 -04:00
xdp xsk: fix OOB map writes when deleting elements 2024-12-14 19:51:33 +01:00
xfrm xfrm: Sanitize marks before insert 2025-06-04 14:38:05 +02:00
compat.c net: Return the correct errno code 2021-06-03 15:13:56 -07:00
devres.c net: devres: Correct a grammatical error 2021-06-11 12:55:28 -07:00
Kconfig Remove DECnet support from kernel 2023-06-21 15:59:15 +02:00
Makefile Remove DECnet support from kernel 2023-06-21 15:59:15 +02:00
socket.c net: explicitly clear the sk pointer, when pf->create fails 2024-10-17 15:12:00 +02:00
sysctl_net.c net: Ensure net namespace isolation of sysctls 2021-04-12 13:27:11 -07:00