Q: Given the following code slice:
```
1 static int register_device(int minor, struct pp_struct *pp)
3 	struct parport *port;
5 	char *name;
9 	name = kasprintf(GFP_KERNEL, CHRDEV "%x", minor);
10 	if (name == NULL)
13 	port = parport_find_number(minor);
14 	if (!port) {
17 		goto err;```
which has a CWE-190 vulnerability at line:
```
17 		goto err;
```
Please analyze the root cause of the vulnerability.