Q: Given the following code slice:
```
1 static int clone_submodule(const struct module_clone_data *clone_data,
6 	char *sm_alternate = NULL, *error_strategy = NULL;```
which has a CWE-476 vulnerability at line:
```
6 	char *sm_alternate = NULL, *error_strategy = NULL;
```
Please analyze the root cause of the vulnerability.