


Q: Given the following code slice:
```
CWE-125___CVE-2024-36934.c___1-60___16.c_vul.c
1 static ssize_t
2 bnad_debugfs_write_regrd(struct file *file, const char __user *buf,
3 		size_t nbytes, loff_t *ppos)
13 	void *kern_buf;
16 	kern_buf = memdup_user(buf, nbytes);

```
which has a vulnerability among CWE-125 and among lines:
```
16 	kern_buf = memdup_user(buf, nbytes);
```
Please generate five possible patches for the vulnerability.
A: The patch can be done in two steps.
Step 1. 