Q: Given the following code slice:
```
1 int iwl_mvm_mld_rm_sta_id(struct iwl_mvm *mvm, u8 sta_id)
3 	int ret = iwl_mvm_mld_rm_sta_from_fw(mvm, sta_id);```
which has a CWE-125 vulnerability at line:
```
3 	int ret = iwl_mvm_mld_rm_sta_from_fw(mvm, sta_id);
```
Please analyze the root cause of the vulnerability.