[patch] MdeModulePkg/MnpDxe: Fix EBC build hang issue

[Dandan Bi <dandan.bi@intel.com>]

Cc: Fu Siyuan <siyuan.fu@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Dandan Bi <dandan.bi@intel.com>
---
 MdeModulePkg/Universal/Network/MnpDxe/MnpConfig.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/MdeModulePkg/Universal/Network/MnpDxe/MnpConfig.c b/MdeModulePkg/Universal/Network/MnpDxe/MnpConfig.c
index d1a4cb5..e24cb75 100644
--- a/MdeModulePkg/Universal/Network/MnpDxe/MnpConfig.c
+++ b/MdeModulePkg/Universal/Network/MnpDxe/MnpConfig.c
@@ -1,9 +1,9 @@
 /** @file
   Implementation of Managed Network Protocol private services.
 
-Copyright (c) 2005 - 2016, Intel Corporation. All rights reserved.<BR>
+Copyright (c) 2005 - 2017, Intel Corporation. All rights reserved.<BR>
 This program and the accompanying materials
 are licensed and made available under the terms and conditions
 of the BSD License which accompanies this distribution.  The full
 text of the license may be found at<BR>
 http://opensource.org/licenses/bsd-license.php
@@ -233,11 +233,11 @@ MnpAddFreeTxBuf (
   NET_CHECK_SIGNATURE (MnpDeviceData, MNP_DEVICE_DATA_SIGNATURE);
   ASSERT ((Count > 0) && (MnpDeviceData->BufferLength > 0));
 
   Status = EFI_SUCCESS;
   for (Index = 0; Index < Count; Index++) {
-    TxBufWrap = (MNP_TX_BUF_WRAP*) AllocatePool (sizeof (MNP_TX_BUF_WRAP) + MnpDeviceData->BufferLength - 1);
+    TxBufWrap = (MNP_TX_BUF_WRAP*) AllocatePool (OFFSET_OF (MNP_TX_BUF_WRAP, TxBuf) + MnpDeviceData->BufferLength );
     if (TxBufWrap == NULL) {
       DEBUG ((EFI_D_ERROR, "MnpAddFreeTxBuf: TxBuf Alloc failed.\n"));
 
       Status = EFI_OUT_OF_RESOURCES;
       break;
-- 
1.9.5.msysgit.1