static int open_will_truncate(int flag, struct inode *inode)
{
	/*
	 * We'll never write to the fs underlying
	 * a device file.
	 */
	if (special_file(inode->i_mode))
		return 0;
	return (flag & O_TRUNC);
}

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.