HttpPostRequestDecoder may cause memory leak #11109

@Override
    public Attribute createAttribute(HttpRequest request, String name, long definedSize) {
        if (useDisk) {
            Attribute attribute = new DiskAttribute(name, definedSize, charset, baseDir, deleteOnExit);
            attribute.setMaxSize(maxSize);
            List<HttpData> list = getList(request);
            list.add(attribute);
            return attribute;
        }
        if (checkSize) {
            Attribute attribute = new MixedAttribute(name, definedSize, minSize, charset, baseDir, deleteOnExit);
            attribute.setMaxSize(maxSize);
            List<HttpData> list = getList(request);
            list.add(attribute);
            return attribute;
        }
        MemoryAttribute attribute = new MemoryAttribute(name, definedSize);
        attribute.setMaxSize(maxSize);
        return attribute;
    }

@Override
    public void cleanAllHttpData() {
        Iterator<Entry<HttpRequest, List<HttpData>>> i = requestFileDeleteMap.entrySet().iterator();
        while (i.hasNext()) {
            Entry<HttpRequest, List<HttpData>> e = i.next();

            // Calling i.remove() here will cause "java.lang.IllegalStateException: Entry was removed"
            // at e.getValue() below

            List<HttpData> list = e.getValue();
            for (HttpData data : list) {
                data.release();
            }

            i.remove();
        }
    }

public void testSubmitForm() throws IOException {
        String boundary = "---------------------------ABCDEFGHIJKLMNOPQRSTUVWXYZ";
        URL url = new URL("http://127.0.0.1:1084/test");
        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
        connection.setConnectTimeout(5000);
        connection.setReadTimeout(30000);
        connection.setDoOutput(true);
        connection.setDoInput(true);
        connection.setUseCaches(false);
        connection.setRequestMethod("POST");
        connection.setRequestProperty("Connection", "Keep-Alive");
        connection.setRequestProperty("User-Agent", "Mozilla/5.0 (Windows; U; Windows NT 6.1; zh-CN; rv:1.9.2.6)");
        connection.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + boundary);

        try (OutputStream out = new DataOutputStream(connection.getOutputStream())) {
            out.write(("\r\n--" + boundary + "\r\n").getBytes(StandardCharsets.UTF_8));
            out.write("Content-Disposition: form-data; name=\"username\"\r\n\r\n".getBytes(StandardCharsets.UTF_8));
            out.write("chinnsii".getBytes(StandardCharsets.UTF_8));

            out.write(("\r\n--" + boundary + "\r\n").getBytes(StandardCharsets.UTF_8));
            out.write("Content-Disposition: form-data; name=\"password\"\r\n\r\n".getBytes(StandardCharsets.UTF_8));
            out.write("chinnsii".getBytes(StandardCharsets.UTF_8));

            byte[] endData = ("\r\n--" + boundary + "--\r\n").getBytes();
            out.write(endData);
            out.flush();
        }

        try (BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()))) {
            String line;
            while ((line = reader.readLine()) != null) {
                System.out.println(line);
            }
        }
    }

Map<String, Object> convert(FullHttpRequest httpRequest) throws IOException {
        HttpDataFactory factory = new DefaultHttpDataFactory(false, CharsetUtil.UTF_8);
        HttpPostRequestDecoder httpDecoder = new HttpPostRequestDecoder(factory, httpRequest);
        try {
            httpDecoder.setDiscardThreshold(0);
            Map<String, Object> params = new HashMap<>();
            List<InterfaceHttpData> InterfaceHttpDataList = httpDecoder.getBodyHttpDatas();
            for (InterfaceHttpData data : InterfaceHttpDataList) {
                if (data != null) {
                    if (InterfaceHttpData.HttpDataType.FileUpload == data.getHttpDataType()) {
                        FileUpload fileUpload = (FileUpload) data;
                        byte[] bytes = fileUpload.get();
                        if (!fileUpload.isInMemory()) {
                            fileUpload.delete();
                        }
                        params.put(data.getName(), bytes);
                    }
                    if (data.getHttpDataType() == InterfaceHttpData.HttpDataType.Attribute) {
                        Attribute attribute = (Attribute) data;
                        params.put(attribute.getName(), attribute.getValue());
                    }
                }
            }
            return params;
        } finally {
            System.out.println("74------------->" + httpRequest.refCnt());
            httpDecoder.destroy();
            System.out.println("76------------>" + httpRequest.refCnt());
        }
}