Q: Given the following code slice:
```
1 void hci_unregister_dev(struct hci_dev *hdev)
2 {
3 	BT_DBG("%p name %s bus %d", hdev, hdev->name, hdev->bus);
4 
5 	mutex_lock(&hdev->unregister_lock);
6 	hci_dev_set_flag(hdev, HCI_UNREGISTER);
7 	mutex_unlock(&hdev->unregister_lock);
8 
9 	write_lock(&hci_dev_list_lock);
10 	list_del(&hdev->list);
11 	write_unlock(&hci_dev_list_lock);
12 
13 	cancel_work_sync(&hdev->power_on);
14 
15 	hci_cmd_sync_clear(hdev);
16 
17 	hci_unregister_suspend_notifier(hdev);
18 
19 	msft_unregister(hdev);
20 
21 	hci_dev_do_close(hdev);
22 
23 	if (!test_bit(HCI_INIT, &hdev->flags) &&
24 	    !hci_dev_test_flag(hdev, HCI_SETUP) &&
25 	    !hci_dev_test_flag(hdev, HCI_CONFIG)) {
26 		hci_dev_lock(hdev);
27 		mgmt_index_removed(hdev);
28 		hci_dev_unlock(hdev);
29 	}
30 
31 	/* mgmt_index_removed should take care of emptying the
32 	 * pending list */
33 	BUG_ON(!list_empty(&hdev->mgmt_pending));
34 
35 	hci_sock_dev_event(hdev, HCI_DEV_UNREG);
36 
37 	if (hdev->rfkill) {
38 		rfkill_unregister(hdev->rfkill);
39 		rfkill_destroy(hdev->rfkill);
40 	}
41 
42 	device_del(&hdev->dev);
43 	/* Actual cleanup is deferred until hci_release_dev(). */
44 	hci_dev_put(hdev);
45 }
```
which has a vulnerability among CWE-457,CWE-476,CWE-787 and among lines:
```
5 	mutex_lock(&hdev->unregister_lock);
7 	mutex_unlock(&hdev->unregister_lock);
9 	write_lock(&hci_dev_list_lock);
11 	write_unlock(&hci_dev_list_lock);
17 	hci_unregister_suspend_notifier(hdev);
19 	msft_unregister(hdev);
26 		hci_dev_lock(hdev);
27 		mgmt_index_removed(hdev);
28 		hci_dev_unlock(hdev);
38 		rfkill_unregister(hdev->rfkill);
```
Please generate five possible patches for the vulnerability.