Fixed: Resource leakage inside ManagedHttpDispatcher.

src/NzbDrone.Common/Http/Dispatchers/ManagedHttpDispatcher.cs

@@ -20,72 +20,84 @@ namespace NzbDrone.Common.Http.Dispatchers
 
         public HttpResponse GetResponse(HttpRequest request, CookieContainer cookies)
         {
-            var webRequest = (HttpWebRequest)WebRequest.Create((Uri)request.Url);
-
-            // Deflate is not a standard and could break depending on implementation.
-            // we should just stick with the more compatible Gzip
-            //http://stackoverflow.com/questions/8490718/how-to-decompress-stream-deflated-with-java-util-zip-deflater-in-net
-            webRequest.AutomaticDecompression = DecompressionMethods.GZip;
-
-            webRequest.Method = request.Method.ToString();
-            webRequest.UserAgent = request.UseSimplifiedUserAgent ? UserAgentBuilder.UserAgentSimplified : UserAgentBuilder.UserAgent;
-            webRequest.KeepAlive = request.ConnectionKeepAlive;
-            webRequest.AllowAutoRedirect = false;
-            webRequest.CookieContainer = cookies;
-
-            if (request.RequestTimeout != TimeSpan.Zero)
+            HttpWebResponse httpWebResponse = null;
+            HttpWebRequest webRequest = null;
+            try
             {
-                webRequest.Timeout = (int)Math.Ceiling(request.RequestTimeout.TotalMilliseconds);
-            }
-
-            AddProxy(webRequest, request);
+                webRequest = (HttpWebRequest) WebRequest.Create((Uri) request.Url);
+
+                // Deflate is not a standard and could break depending on implementation.
+                // we should just stick with the more compatible Gzip
+                //http://stackoverflow.com/questions/8490718/how-to-decompress-stream-deflated-with-java-util-zip-deflater-in-net
+                webRequest.AutomaticDecompression = DecompressionMethods.GZip;
+
+                webRequest.Method = request.Method.ToString();
+                webRequest.UserAgent = request.UseSimplifiedUserAgent
+                    ? UserAgentBuilder.UserAgentSimplified
+                    : UserAgentBuilder.UserAgent;
+                webRequest.KeepAlive = request.ConnectionKeepAlive;
+                webRequest.AllowAutoRedirect = false;
+                webRequest.CookieContainer = cookies;
+
+                if (request.RequestTimeout != TimeSpan.Zero)
+                {
+                    webRequest.Timeout = (int) Math.Ceiling(request.RequestTimeout.TotalMilliseconds);
+                }
 
-            if (request.Headers != null)
-            {
-                AddRequestHeaders(webRequest, request.Headers);
-            }
+                AddProxy(webRequest, request);
 
-            if (request.ContentData != null)
-            {
-                webRequest.ContentLength = request.ContentData.Length;
-                using (var writeStream = webRequest.GetRequestStream())
+                if (request.Headers != null)
                 {
-                    writeStream.Write(request.ContentData, 0, request.ContentData.Length);
+                    AddRequestHeaders(webRequest, request.Headers);
                 }
-            }
 
-            HttpWebResponse httpWebResponse;
+                if (request.ContentData != null)
+                {
+                    webRequest.ContentLength = request.ContentData.Length;
+                    using (var writeStream = webRequest.GetRequestStream())
+                    {
+                        writeStream.Write(request.ContentData, 0, request.ContentData.Length);
+                    }
+                }
 
-            try
-            {
-                httpWebResponse = (HttpWebResponse)webRequest.GetResponse();
-            }
-            catch (WebException e)
-            {
-                if (e.Status == WebExceptionStatus.SecureChannelFailure && OsInfo.IsWindows)
+                try
                 {
-                    SecurityProtocolPolicy.DisableTls12();
+                    httpWebResponse = (HttpWebResponse) webRequest.GetResponse();
                 }
+                catch (WebException e)
+                {
+                    if (e.Status == WebExceptionStatus.SecureChannelFailure && OsInfo.IsWindows)
+                    {
+                        SecurityProtocolPolicy.DisableTls12();
+                    }
 
-                httpWebResponse = (HttpWebResponse)e.Response;
+                    httpWebResponse = (HttpWebResponse) e.Response;
 
-                if (httpWebResponse == null)
-                {
-                    throw;
+                    if (httpWebResponse == null)
+                    {
+                        throw;
+                    }
                 }
-            }
 
-            byte[] data = null;
+                byte[] data = null;
 
-            using (var responseStream = httpWebResponse.GetResponseStream())
-            {
-                if (responseStream != null)
+                using (var responseStream = httpWebResponse.GetResponseStream())
                 {
-                    data = responseStream.ToBytes();
+                    if (responseStream != null)
+                    {
+                        data = responseStream.ToBytes();
+                    }
                 }
-            }
 
-            return new HttpResponse(request, new HttpHeader(httpWebResponse.Headers), data, httpWebResponse.StatusCode);
+                return new HttpResponse(request, new HttpHeader(httpWebResponse.Headers), data,
+                    httpWebResponse.StatusCode);
+            }
+            finally
+            {
+                webRequest = null;
+                httpWebResponse?.Dispose();
+                httpWebResponse = null;
+            }
         }
 
         protected virtual void AddProxy(HttpWebRequest webRequest, HttpRequest request)