add security check.

[mirror_edk2.git] / MdeModulePkg / Universal / Network / Ip4Dxe / Ip4If.c

diff --git a/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4If.c b/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4If.c
index 9cb71473128e835d16ba63f4206b72b03b1dc66e..dd2674d22400e11f05daef17db7aebde7ff872e9 100644 (file)
--- a/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4If.c
+++ b/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4If.c
@@ -1,7 +1,7 @@
 /** @file\r
   Implement IP4 pesudo interface.\r
   \r
-Copyright (c) 2005 - 2007, Intel Corporation.<BR>\r
+Copyright (c) 2005 - 2009, Intel Corporation.<BR>\r
 All rights reserved. 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
@@ -582,7 +582,7 @@ Ip4SetAddress (
 \r
   Type                      = NetGetIpClass (IpAddr);\r
   Len                       = NetGetMaskLength (SubnetMask);\r
-  Netmask                   = gIp4AllMasks[MIN (Len, Type << 3)];\r
+  Netmask                   = gIp4AllMasks[MIN ((Len - 1), Type << 3)];\r
   Interface->NetBrdcast     = (IpAddr | ~Netmask);\r
 \r
   //\r