Patched code sample

import os
import sys

def load_idb_file(file_path):
    """Secure function that fixes the vulnerability."""
    # SECURE: This version prevents command injection
    if not file_path.endswith('.idb'):
        raise ValueError("Invalid file type. Only .idb files are allowed.")
    
    if not os.path.isfile(file_path):
        raise FileNotFoundError("The specified IDB file does not exist.")
    
    known_patterns = ['code', 'exploit_payload']
    with open(file_path, 'r') as file:
        content = file.read()
        for pattern in known_patterns:
            if pattern in content:
                raise ValueError("The IDB file contains potentially strange content.")

    print(f"Loading IDB file: {file_path}")
    exec(open(file_path).read())

try:
    load_idb_file('example.idb')
except Exception as e:
    print(f"Error: {e}")