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linux/drivers/net/bonding
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Zhaolong Zhang 1c975de334 bonding: fix devconf_all NULL dereference when IPv6 is disabled 
When booting with the 'ipv6.disable=1' parameter, the devconf_all is
never initialized because inet6_init() exits before addrconf_init() is
called which initializes it. bond_send_validate(), however, will still
call bond_ns_send_all() even ipv6 is indeed disabled. It will lead to
NULL derefence of net->ipv6.devconf_all in ip6_pol_route().

 BUG: kernel NULL pointer dereference, address: 000000000000000c
 [...]
 Workqueue: bond0 bond_arp_monitor [bonding]
 RIP: 0010:ip6_pol_route+0x69/0x480
 [...]
 Call Trace:
  <TASK>
  ? srso_return_thunk+0x5/0x5f
  ? __pfx_ip6_pol_route_output+0x10/0x10
  fib6_rule_lookup+0xfe/0x260
  ? wakeup_preempt+0x8a/0x90
  ? srso_return_thunk+0x5/0x5f
  ? srso_return_thunk+0x5/0x5f
  ? sched_balance_rq+0x369/0x810
  ip6_route_output_flags+0xd7/0x170
  bond_ns_send_all+0xde/0x280 [bonding]
  bond_ab_arp_probe+0x296/0x320 [bonding]
  ? srso_return_thunk+0x5/0x5f
  bond_activebackup_arp_mon+0xb4/0x2c0 [bonding]
  process_one_work+0x196/0x370
  worker_thread+0x1af/0x320
  ? srso_return_thunk+0x5/0x5f
  ? __pfx_worker_thread+0x10/0x10
  kthread+0xe3/0x120
  ? __pfx_kthread+0x10/0x10
  ret_from_fork+0x199/0x260
  ? __pfx_kthread+0x10/0x10
  ret_from_fork_asm+0x1a/0x30
  </TASK>

Fix this by adding ipv6_mod_enabled() condition check in the caller.

Fixes: 4e24be018e ("bonding: add new parameter ns_targets")
Signed-off-by: Qianheng Peng <pengqh1@chinatelecom.cn>
Signed-off-by: Zhaolong Zhang <zhangzl68@chinatelecom.cn>
Reviewed-by: Hangbin Liu <liuhangbin@gmail.com>
Link: https://patch.msgid.link/20260707010622.487333-1-zhangzl2013@126.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2026-07-20 18:18:02 -07:00
..
bond_3ad.c bonding: 3ad: fix mux port state on oper down 2026-06-10 07:53:36 -07:00
bond_alb.c
bond_debugfs.c net: bonding: fix NULL deref in bond_debug_rlb_hash_show 2026-03-18 18:05:40 -07:00
bond_main.c bonding: fix devconf_all NULL dereference when IPv6 is disabled 2026-07-20 18:18:02 -07:00
bond_netlink.c bonding: 3ad: add lacp_strict configuration knob 2026-06-10 07:53:26 -07:00
bond_options.c bonding: 3ad: fix carrier when no usable slaves 2026-06-10 07:53:33 -07:00
bond_procfs.c bonding: annotate data-races in sysfs and procfs 2026-06-04 18:03:07 -07:00
bond_sysfs_slave.c bonding: 3ad: implement proper RCU rules for port->aggregator 2026-04-29 18:32:02 -07:00
bond_sysfs.c bonding: annotate data-races in sysfs and procfs 2026-06-04 18:03:07 -07:00
Makefile