MdeModulePkg/BMMUiLib: Remove old useless data before new save action

[mirror_edk2.git] / MdeModulePkg / Library / DxeUdpIoLib / DxeUdpIoLib.c

diff --git a/MdeModulePkg/Library/DxeUdpIoLib/DxeUdpIoLib.c b/MdeModulePkg/Library/DxeUdpIoLib/DxeUdpIoLib.c
index e1d72f3f1c68929721a7ce4a56b918951ffc9f11..4861095435e6b13eadd2d83856219addb2344b8d 100644 (file)
--- a/MdeModulePkg/Library/DxeUdpIoLib/DxeUdpIoLib.c
+++ b/MdeModulePkg/Library/DxeUdpIoLib/DxeUdpIoLib.c
@@ -1,7 +1,7 @@
 /** @file\r
   Help functions to access UDP service, it is used by both the DHCP and MTFTP.\r
 \r
-Copyright (c) 2005 - 2012, Intel Corporation. All rights reserved.<BR>\r
+Copyright (c) 2005 - 2016, Intel Corporation. All rights reserved.<BR>\r
 This program and the accompanying materials\r
 are licensed and made available under the terms and conditions of the BSD License\r
 which accompanies this distribution.  The full text of the license may be found at<BR>\r
@@ -215,6 +215,12 @@ UdpIoOnDgramRcvdDpc (
   // Build a NET_BUF from the UDP receive data, then deliver it up.\r
   //\r
   if (RxToken->UdpIo->UdpVersion == UDP_IO_UDP4_VERSION) {\r
+    if (((EFI_UDP4_RECEIVE_DATA *) RxData)->DataLength == 0) {\r
+      //\r
+      // Discard zero length data payload packet.\r
+      //\r
+      goto Resume;\r
+    }\r
 \r
     Netbuf = NetbufFromExt (\r
                (NET_FRAGMENT *)((EFI_UDP4_RECEIVE_DATA *) RxData)->FragmentTable,\r
@@ -252,6 +258,12 @@ UdpIoOnDgramRcvdDpc (
     EndPoint.LocalAddr.Addr[0]  = NTOHL (EndPoint.LocalAddr.Addr[0]);\r
     EndPoint.RemoteAddr.Addr[0] = NTOHL (EndPoint.RemoteAddr.Addr[0]);\r
   } else {\r
+    if (((EFI_UDP6_RECEIVE_DATA *) RxData)->DataLength == 0) {\r
+      //\r
+      // Discard zero length data payload packet.\r
+      //\r
+      goto Resume;\r
+    }\r
 \r
     Netbuf = NetbufFromExt (\r
                (NET_FRAGMENT *)((EFI_UDP6_RECEIVE_DATA *) RxData)->FragmentTable,\r
@@ -291,6 +303,16 @@ UdpIoOnDgramRcvdDpc (
   }\r
 \r
   RxToken->CallBack (Netbuf, &EndPoint, EFI_SUCCESS, RxToken->Context);\r
+  return;\r
+\r
+Resume:\r
+  if (RxToken->UdpIo->UdpVersion == UDP_IO_UDP4_VERSION) {\r
+    gBS->SignalEvent (((EFI_UDP4_RECEIVE_DATA *) RxData)->RecycleSignal);\r
+    RxToken->UdpIo->Protocol.Udp4->Receive (RxToken->UdpIo->Protocol.Udp4, &RxToken->Token.Udp4);\r
+  } else {\r
+    gBS->SignalEvent (((EFI_UDP6_RECEIVE_DATA *) RxData)->RecycleSignal);\r
+    RxToken->UdpIo->Protocol.Udp6->Receive (RxToken->UdpIo->Protocol.Udp6, &RxToken->Token.Udp6);\r
+  }\r
 }\r
 \r
 /**\r