Q: Given the following code slice:
```
1 void v9fs_evict_inode(struct inode *inode)
6 	truncate_inode_pages_final(&inode->i_data);```
which has a CWE-787 vulnerability at line:
```
6 	truncate_inode_pages_final(&inode->i_data);
```
Please analyze the root cause of the vulnerability.