Q: Given the following code slice:
```
1 static ssize_t crw_inject_write(struct file *file, const char __user *buf,
2 				size_t lbuf, loff_t *ppos)
3 {
4 	u32 slct, oflw, chn, rsc, anc, erc, rsid;
5 	struct crw crw;
6 	char *buffer;
7 	int rc;
8 
9 	if (!static_branch_likely(&cio_inject_enabled)) {
10 		pr_warn("CIO inject is not enabled - ignoring CRW inject\n");
11 		return -EINVAL;
12 	}
13 
14 	buffer = vmemdup_user(buf, lbuf);
15 	if (IS_ERR(buffer))
16 		return -ENOMEM;
17 
18 	rc = sscanf(buffer, "%x %x %x %x %x %x %x", &slct, &oflw, &chn, &rsc, &anc,
19 		    &erc, &rsid);
20 
21 	kvfree(buffer);
22 	if (rc != 7) {
23 		pr_warn("crw_inject: Invalid format (need <solicited> <overflow> <chaining> <rsc> <ancillary> <erc> <rsid>)\n");
24 		return -EINVAL;
25 	}
26 
27 	memset(&crw, 0, sizeof(crw));
28 	crw.slct = slct;
29 	crw.oflw = oflw;
30 	crw.chn = chn;
31 	crw.rsc = rsc;
32 	crw.anc = anc;
33 	crw.erc = erc;
34 	crw.rsid = rsid;
35 
36 	rc = crw_inject(&crw);
37 	if (rc)
38 		return rc;
39 
40 	return lbuf;
41 }
```
which has a vulnerability among CWE-416,CWE-787,CWE-125 and among lines:
```
14 	buffer = vmemdup_user(buf, lbuf);
21 	kvfree(buffer);
27 	memset(&crw, 0, sizeof(crw));
```
Please generate five possible patches for the vulnerability.