 void yyerror (char *msg)
{
	int retval;

	ip_file->err_line_no = ip_file->prev_token_line_no;
	ip_file->err_col_no = ip_file->prev_token_col_no;
	
	msyslog(LOG_ERR, 
		"line %d column %d %s", 
		ip_file->err_line_no,
		ip_file->err_col_no,
		msg);
	if (!input_from_file) {
		/* Save the error message in the correct buffer */
		retval = snprintf(remote_config.err_msg + remote_config.err_pos,
				  MAXLINE - remote_config.err_pos,
				  "column %d %s",
				  ip_file->err_col_no, msg);

		/* Increment the value of err_pos */
		if (retval > 0)
			remote_config.err_pos += retval;

		/* Increment the number of errors */
		++remote_config.no_errors;
	}
}

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.