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linux/drivers/net/bonding
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Ricardo B. Marlière 95faa1459b net: bonding: Fix nd_tbl NULL dereference when IPv6 is disabled 
[ Upstream commit 30021e969d ]

When booting with the 'ipv6.disable=1' parameter, the nd_tbl is never
initialized because inet6_init() exits before ndisc_init() is called
which initializes it. If bonding ARP/NS validation is enabled, an IPv6
NS/NA packet received on a slave can reach bond_validate_na(), which
calls bond_has_this_ip6(). That path calls ipv6_chk_addr() and can
crash in __ipv6_chk_addr_and_flags().

 BUG: kernel NULL pointer dereference, address: 00000000000005d8
 Oops: Oops: 0000 [#1] SMP NOPTI
 RIP: 0010:__ipv6_chk_addr_and_flags+0x69/0x170
 Call Trace:
  <IRQ>
  ipv6_chk_addr+0x1f/0x30
  bond_validate_na+0x12e/0x1d0 [bonding]
  ? __pfx_bond_handle_frame+0x10/0x10 [bonding]
  bond_rcv_validate+0x1a0/0x450 [bonding]
  bond_handle_frame+0x5e/0x290 [bonding]
  ? srso_alias_return_thunk+0x5/0xfbef5
  __netif_receive_skb_core.constprop.0+0x3e8/0xe50
  ? srso_alias_return_thunk+0x5/0xfbef5
  ? update_cfs_rq_load_avg+0x1a/0x240
  ? srso_alias_return_thunk+0x5/0xfbef5
  ? __enqueue_entity+0x5e/0x240
  __netif_receive_skb_one_core+0x39/0xa0
  process_backlog+0x9c/0x150
  __napi_poll+0x30/0x200
  ? srso_alias_return_thunk+0x5/0xfbef5
  net_rx_action+0x338/0x3b0
  handle_softirqs+0xc9/0x2a0
  do_softirq+0x42/0x60
  </IRQ>
  <TASK>
  __local_bh_enable_ip+0x62/0x70
  __dev_queue_xmit+0x2d3/0x1000
  ? srso_alias_return_thunk+0x5/0xfbef5
  ? srso_alias_return_thunk+0x5/0xfbef5
  ? packet_parse_headers+0x10a/0x1a0
  packet_sendmsg+0x10da/0x1700
  ? kick_pool+0x5f/0x140
  ? srso_alias_return_thunk+0x5/0xfbef5
  ? __queue_work+0x12d/0x4f0
  __sys_sendto+0x1f3/0x220
  __x64_sys_sendto+0x24/0x30
  do_syscall_64+0x101/0xf80
  ? exc_page_fault+0x6e/0x170
  ? srso_alias_return_thunk+0x5/0xfbef5
  entry_SYSCALL_64_after_hwframe+0x77/0x7f
  </TASK>

Fix this by checking ipv6_mod_enabled() before dispatching IPv6 packets to
bond_na_rcv(). If IPv6 is disabled, return early from bond_rcv_validate()
and avoid the path to ipv6_chk_addr().

Suggested-by: Fernando Fernandez Mancera <fmancera@suse.de>
Fixes: 4e24be018e ("bonding: add new parameter ns_targets")
Signed-off-by: Ricardo B. Marlière <rbm@suse.com>
Reviewed-by: Hangbin Liu <liuhangbin@gmail.com>
Link: https://patch.msgid.link/20260307-net-nd_tbl_fixes-v4-2-e2677e85628c@suse.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2026-03-19 16:08:20 +01:00
..
bond_3ad.c bonding: support aggregator selection based on port priority 2025-09-09 10:56:02 +02:00
bond_alb.c net: core: Convert dev_set_mac_address() to struct sockaddr_storage 2025-05-27 08:25:43 +02:00
bond_debugfs.c saner replacement for debugfs_rename() 2025-01-15 13:14:37 +01:00
bond_main.c net: bonding: Fix nd_tbl NULL dereference when IPv6 is disabled 2026-03-19 16:08:20 +01:00
bond_netlink.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2025-10-01 10:14:49 +02:00
bond_options.c bpf/bonding: reject vlan+srcmac xmit_hash_policy change when XDP is loaded 2026-03-12 07:09:53 -04:00
bond_procfs.c bonding: no longer use RTNL in bonding_show_queue_id() 2024-04-09 17:31:45 -07:00
bond_sysfs.c bonding: Remove support for use_carrier 2025-09-02 14:01:54 -07:00
bond_sysfs_slave.c bonding: no longer use RTNL in bonding_show_queue_id() 2024-04-09 17:31:45 -07:00
bonding_priv.h net: bonding: Add SPDX identifier to remaining files 2023-05-16 15:38:06 +02:00
Makefile treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00