CVE-2022-50419

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: hci_sysfs: Fix attempting to call device_add multiple times

device_add shall not be called multiple times as stated in its

documentation:

'Do not call this routine or device_register() more than once for

any device structure'

Syzkaller reports a bug as follows [1]:

------------[ cut here ]------------

kernel BUG at lib/list_debug.c:33!

invalid opcode: 0000 [#1] PREEMPT SMP KASAN

[...]

Call Trace:

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__list_add include/linux/list.h:69 [inline]

list_add_tail include/linux/list.h:102 [inline]

kobj_kset_join lib/kobject.c:164 [inline]

kobject_add_internal+0x18f/0x8f0 lib/kobject.c:214

kobject_add_varg lib/kobject.c:358 [inline]

kobject_add+0x150/0x1c0 lib/kobject.c:410

device_add+0x368/0x1e90 drivers/base/core.c:3452

hci_conn_add_sysfs+0x9b/0x1b0 net/bluetooth/hci_sysfs.c:53

hci_le_cis_estabilished_evt+0x57c/0xae0 net/bluetooth/hci_event.c:6799

hci_le_meta_evt+0x2b8/0x510 net/bluetooth/hci_event.c:7110

hci_event_func net/bluetooth/hci_event.c:7440 [inline]

hci_event_packet+0x63d/0xfd0 net/bluetooth/hci_event.c:7495

hci_rx_work+0xae7/0x1230 net/bluetooth/hci_core.c:4007

process_one_work+0x991/0x1610 kernel/workqueue.c:2289

worker_thread+0x665/0x1080 kernel/workqueue.c:2436

kthread+0x2e4/0x3a0 kernel/kthread.c:376

ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306

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