Q: Given the following code slice:
```
1 static void free_netvsc_device(struct rcu_head *head)
2 {
3 	struct netvsc_device *nvdev
4 		= container_of(head, struct netvsc_device, rcu);
5 	int i;
6 
7 	kfree(nvdev->extension);
8 	vfree(nvdev->recv_buf);
9 	vfree(nvdev->send_buf);
10 	bitmap_free(nvdev->send_section_map);
11 
12 	for (i = 0; i < VRSS_CHANNEL_MAX; i++) {
13 		xdp_rxq_info_unreg(&nvdev->chan_table[i].xdp_rxq);
14 		kfree(nvdev->chan_table[i].recv_buf);
15 		vfree(nvdev->chan_table[i].mrc.slots);
16 	}
17 
18 	kfree(nvdev);
19 }
```
which has a vulnerability among CWE-401 and among lines:
```
7 	kfree(nvdev->extension);
8 	vfree(nvdev->recv_buf);
9 	vfree(nvdev->send_buf);
10 	bitmap_free(nvdev->send_section_map);
14 		kfree(nvdev->chan_table[i].recv_buf);
15 		vfree(nvdev->chan_table[i].mrc.slots);
18 	kfree(nvdev);
```
Please generate five possible patches for the vulnerability.