CVE-2022-50419

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

Bluetooth: hcisysfs: Fix attempting to call deviceadd 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: <TASK> _listadd include/linux/list.h:69 [inline] listaddtail include/linux/list.h:102 [inline] kobjksetjoin lib/kobject.c:164 [inline] kobjectaddinternal+0x18f/0x8f0 lib/kobject.c:214 kobjectaddvarg lib/kobject.c:358 [inline] kobjectadd+0x150/0x1c0 lib/kobject.c:410 deviceadd+0x368/0x1e90 drivers/base/core.c:3452 hciconnaddsysfs+0x9b/0x1b0 net/bluetooth/hcisysfs.c:53 hcilecisestabilishedevt+0x57c/0xae0 net/bluetooth/hcievent.c:6799 hcilemetaevt+0x2b8/0x510 net/bluetooth/hcievent.c:7110 hcieventfunc net/bluetooth/hcievent.c:7440 [inline] hcieventpacket+0x63d/0xfd0 net/bluetooth/hcievent.c:7495 hcirxwork+0xae7/0x1230 net/bluetooth/hcicore.c:4007 processonework+0x991/0x1610 kernel/workqueue.c:2289 workerthread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e4/0x3a0 kernel/kthread.c:376 retfromfork+0x1f/0x30 arch/x86/entry/entry64.S:306 </TASK>