Q: Given the following code slice:
```
1 static int qca_read_fw_build_info(struct hci_dev *hdev)
2 {
3 	struct sk_buff *skb;
4 	struct edl_event_hdr *edl;
5 	char cmd, build_label[QCA_FW_BUILD_VER_LEN];
6 	int build_lbl_len, err = 0;
7 
8 	bt_dev_dbg(hdev, "QCA read fw build info");
9 
10 	cmd = EDL_GET_BUILD_INFO_CMD;
11 	skb = __hci_cmd_sync_ev(hdev, EDL_PATCH_CMD_OPCODE, EDL_PATCH_CMD_LEN,
12 				&cmd, 0, HCI_INIT_TIMEOUT);
13 	if (IS_ERR(skb)) {
14 		err = PTR_ERR(skb);
15 		bt_dev_err(hdev, "Reading QCA fw build info failed (%d)",
16 			   err);
17 		return err;
18 	}
19 
20 	edl = (struct edl_event_hdr *)(skb->data);
21 	if (!edl) {
22 		bt_dev_err(hdev, "QCA read fw build info with no header");
23 		err = -EILSEQ;
24 		goto out;
25 	}
26 
27 	if (edl->cresp != EDL_CMD_REQ_RES_EVT ||
28 	    edl->rtype != EDL_GET_BUILD_INFO_CMD) {
29 		bt_dev_err(hdev, "QCA Wrong packet received %d %d", edl->cresp,
30 			   edl->rtype);
31 		err = -EIO;
32 		goto out;
33 	}
34 
35 	build_lbl_len = edl->data[0];
36 	if (build_lbl_len <= QCA_FW_BUILD_VER_LEN - 1) {
37 		memcpy(build_label, edl->data + 1, build_lbl_len);
38 		*(build_label + build_lbl_len) = '\0';
39 	}
40 
41 	hci_set_fw_info(hdev, "%s", build_label);
42 
43 out:
44 	kfree_skb(skb);
45 	return err;
46 }
```
which has a vulnerability among CWE-416,CWE-787 and among lines:
```
37 		memcpy(build_label, edl->data + 1, build_lbl_len);
44 	kfree_skb(skb);
```
Please generate five possible patches for the vulnerability.