Fixed the issue of that IP4driver can’t correctly reassemble the Out of Sequence...

[mirror_edk2.git] / MdeModulePkg / Universal / Network / Ip4Dxe / Ip4Input.c

diff --git a/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Input.c b/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Input.c
index 24d2f29d383de45239df4c5028632fd9a23a1560..d888e18e4cc7d6b8cc83b12d9a28afa092bec47e 100644 (file)
--- a/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Input.c
+++ b/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Input.c
@@ -1,8 +1,8 @@
 /** @file\r
   IP4 input process.\r
   \r
-Copyright (c) 2005 - 2010, Intel Corporation.<BR>\r
-All rights reserved. This program and the accompanying materials\r
+Copyright (c) 2005 - 2010, 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\r
 http://opensource.org/licenses/bsd-license.php\r
@@ -292,7 +292,7 @@ Ip4Reassemble (
   // check whether THIS.Start < PREV.End for overlap. If two fragments\r
   // overlaps, trim the overlapped part off THIS fragment.\r
   //\r
-  if ((Prev = Cur->ForwardLink) != Head) {\r
+  if ((Cur != Head) && ((Prev = Cur->BackLink) != Head)) {\r
     Fragment  = NET_LIST_USER_STRUCT (Prev, NET_BUF, List);\r
     Node      = IP4_GET_CLIP_INFO (Fragment);\r
 \r