[Patch 2/2] NetworkPkg: Fix potential ASSERT if NetIp4IsUnicast is called

[Jiaxin Wu <jiaxin.wu@intel.com>]

Cc: Hegde Nagaraj P <nagaraj-p.hegde@hpe.com>
Cc: Subramanian Sriram <sriram-s@hpe.com>
Cc: Zhang Lubo <lubo.zhang@intel.com>
Cc: Ye Ting <ting.ye@intel.com>
Cc: Fu Siyuan <siyuan.fu@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Wu Jiaxin <jiaxin.wu@intel.com>
---
 NetworkPkg/DnsDxe/DnsProtocol.c     | 4 ++--
 NetworkPkg/TcpDxe/TcpMain.c         | 5 +++--
 NetworkPkg/UefiPxeBcDxe/PxeBcImpl.c | 5 +++--
 3 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/NetworkPkg/DnsDxe/DnsProtocol.c b/NetworkPkg/DnsDxe/DnsProtocol.c
index 6d117b2..0e7ed34 100644
--- a/NetworkPkg/DnsDxe/DnsProtocol.c
+++ b/NetworkPkg/DnsDxe/DnsProtocol.c
@@ -1,9 +1,9 @@
 /** @file
 Implementation of EFI_DNS4_PROTOCOL and EFI_DNS6_PROTOCOL interfaces.
 
-Copyright (c) 2015 - 2016, Intel Corporation. All rights reserved.<BR>
+Copyright (c) 2015 - 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
 http://opensource.org/licenses/bsd-license.php
 
@@ -244,11 +244,11 @@ Dns4Configure (
 
     Ip       = NTOHL (Ip);
     Netmask  = NTOHL (Netmask);
 
     if (!DnsConfigData->UseDefaultSetting &&
-       ((!IP4_IS_VALID_NETMASK (Netmask) || !NetIp4IsUnicast (Ip, Netmask)))) {
+        ((!IP4_IS_VALID_NETMASK (Netmask) || (Netmask != 0 && !NetIp4IsUnicast (Ip, Netmask))))) {
       Status = EFI_INVALID_PARAMETER;
       goto ON_EXIT;
     }
 
     Status = Dns4CopyConfigure (&Instance->Dns4CfgData, DnsConfigData);
diff --git a/NetworkPkg/TcpDxe/TcpMain.c b/NetworkPkg/TcpDxe/TcpMain.c
index 03942ee..fc3713e 100644
--- a/NetworkPkg/TcpDxe/TcpMain.c
+++ b/NetworkPkg/TcpDxe/TcpMain.c
@@ -1,10 +1,10 @@
 /** @file
   Implementation of EFI_TCP4_PROTOCOL and EFI_TCP6_PROTOCOL.
 
   (C) Copyright 2014 Hewlett-Packard Development Company, L.P.<BR>
-  Copyright (c) 2009 - 2016, Intel Corporation. All rights reserved.<BR>
+  Copyright (c) 2009 - 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
   http://opensource.org/licenses/bsd-license.php.
@@ -157,11 +157,12 @@ Tcp4Configure (
 
     if (!TcpConfigData->AccessPoint.UseDefaultAddress) {
 
       CopyMem (&Ip, &TcpConfigData->AccessPoint.StationAddress, sizeof (IP4_ADDR));
       CopyMem (&SubnetMask, &TcpConfigData->AccessPoint.SubnetMask, sizeof (IP4_ADDR));
-      if (!IP4_IS_VALID_NETMASK (NTOHL (SubnetMask)) || !NetIp4IsUnicast (NTOHL (Ip), NTOHL (SubnetMask))) {
+      if (!IP4_IS_VALID_NETMASK (NTOHL (SubnetMask)) || 
+          (SubnetMask != 0 && !NetIp4IsUnicast (NTOHL (Ip), NTOHL (SubnetMask)))) {
         return EFI_INVALID_PARAMETER;
       }
     }
 
     Option = TcpConfigData->ControlOption;
diff --git a/NetworkPkg/UefiPxeBcDxe/PxeBcImpl.c b/NetworkPkg/UefiPxeBcDxe/PxeBcImpl.c
index 36477e9..ab9e494 100644
--- a/NetworkPkg/UefiPxeBcDxe/PxeBcImpl.c
+++ b/NetworkPkg/UefiPxeBcDxe/PxeBcImpl.c
@@ -1083,11 +1083,12 @@ EfiPxeBcUdpWrite (
     DoNotFragment = FALSE;
   } else {
     DoNotFragment = TRUE;
   }
 
-  if (!Mode->UsingIpv6 && GatewayIp != NULL && !NetIp4IsUnicast (NTOHL (GatewayIp->Addr[0]), EFI_NTOHL(Mode->SubnetMask))) {
+  if (!Mode->UsingIpv6 && GatewayIp != NULL && Mode->SubnetMask.Addr[0] != 0 && 
+      !NetIp4IsUnicast (NTOHL (GatewayIp->Addr[0]), EFI_NTOHL(Mode->SubnetMask))) {
     //
     // Gateway is provided but it's not a unicast IPv4 address, while it will be ignored for IPv6.
     //
     return EFI_INVALID_PARAMETER;
   }
@@ -2014,11 +2015,11 @@ EfiPxeBcSetStationIP (
   }
 
   if (!Mode->UsingIpv6 && NewStationIp != NULL) {
     if (IP4_IS_UNSPECIFIED(NTOHL (NewStationIp->Addr[0])) || 
         IP4_IS_LOCAL_BROADCAST(NTOHL (NewStationIp->Addr[0])) ||
-        (NewSubnetMask != NULL && !NetIp4IsUnicast (NTOHL (NewStationIp->Addr[0]), NTOHL (NewSubnetMask->Addr[0])))) {
+        (NewSubnetMask != NULL && NewSubnetMask->Addr[0] != 0 && !NetIp4IsUnicast (NTOHL (NewStationIp->Addr[0]), NTOHL (NewSubnetMask->Addr[0])))) {
       return EFI_INVALID_PARAMETER;
     }
   }
   
   if (!Mode->Started) {
-- 
1.9.5.msysgit.1