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authorStanislav Fomichev <sdf@fomichev.me>2025-08-06 14:37:25 -0700
committerJakub Kicinski <kuba@kernel.org>2025-08-08 13:22:28 -0700
commit53898ebabe843bfa7baea9dae152797d5d0563c9 (patch)
tree4d89e16220e88289752e19cdc448702e662e20b9 /scripts/lib/kdoc/kdoc_files.py
parent829f45f9d992019b49f08ab425ca11288b084aed (diff)
net: lapbether: ignore ops-locked netdevs
Syzkaller managed to trigger lock dependency in xsk_notify via register_netdevice. As discussed in [0], using register_netdevice in the notifiers is problematic so skip adding lapbeth for ops-locked devices. xsk_notifier+0xa4/0x280 net/xdp/xsk.c:1645 notifier_call_chain+0xbc/0x410 kernel/notifier.c:85 call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:2230 call_netdevice_notifiers_extack net/core/dev.c:2268 [inline] call_netdevice_notifiers net/core/dev.c:2282 [inline] unregister_netdevice_many_notify+0xf9d/0x2700 net/core/dev.c:12077 unregister_netdevice_many net/core/dev.c:12140 [inline] unregister_netdevice_queue+0x305/0x3f0 net/core/dev.c:11984 register_netdevice+0x18f1/0x2270 net/core/dev.c:11149 lapbeth_new_device drivers/net/wan/lapbether.c:420 [inline] lapbeth_device_event+0x5b1/0xbe0 drivers/net/wan/lapbether.c:462 notifier_call_chain+0xbc/0x410 kernel/notifier.c:85 call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:2230 call_netdevice_notifiers_extack net/core/dev.c:2268 [inline] call_netdevice_notifiers net/core/dev.c:2282 [inline] __dev_notify_flags+0x12c/0x2e0 net/core/dev.c:9497 netif_change_flags+0x108/0x160 net/core/dev.c:9526 dev_change_flags+0xba/0x250 net/core/dev_api.c:68 devinet_ioctl+0x11d5/0x1f50 net/ipv4/devinet.c:1200 inet_ioctl+0x3a7/0x3f0 net/ipv4/af_inet.c:1001 0: https://lore.kernel.org/netdev/20250625140357.6203d0af@kernel.org/ Fixes: 4c975fd70002 ("net: hold instance lock during NETDEV_REGISTER/UP") Suggested-by: Jakub Kicinski <kuba@kernel.org> Reported-by: syzbot+e67ea9c235b13b4f0020@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=e67ea9c235b13b4f0020 Signed-off-by: Stanislav Fomichev <sdf@fomichev.me> Link: https://patch.msgid.link/20250806213726.1383379-1-sdf@fomichev.me Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'scripts/lib/kdoc/kdoc_files.py')
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