From 08aa37e0157271b87e917c598260644920c4ed57 Mon Sep 17 00:00:00 2001
From: lgao4 <lgao4@6f19259b-4bc3-4df7-8a09-765794883524>
Date: Wed, 14 Mar 2007 07:42:20 +0000
Subject: [PATCH] Add check whether input parameter is NULL before call
 freepool API defined in MDE.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@2461 6f19259b-4bc3-4df7-8a09-765794883524
---
 .../Console/ConSplitter/Dxe/ConSplitterGraphics.c      | 10 +++++++---
 .../Universal/Console/Terminal/Dxe/Terminal.msa        |  2 +-
 2 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/EdkModulePkg/Universal/Console/ConSplitter/Dxe/ConSplitterGraphics.c b/EdkModulePkg/Universal/Console/ConSplitter/Dxe/ConSplitterGraphics.c
index 9faeb56d12..2f60e11c40 100644
--- a/EdkModulePkg/Universal/Console/ConSplitter/Dxe/ConSplitterGraphics.c
+++ b/EdkModulePkg/Universal/Console/ConSplitter/Dxe/ConSplitterGraphics.c
@@ -1314,8 +1314,10 @@ DevNullTextOutSetMode (
     Private->TextOutMode.Mode = (INT32) ModeNumber;
     Private->DevNullColumns   = Column;
     Private->DevNullRows      = Row;
-
-    FreePool (Private->DevNullScreen);
+    
+    if (Private->DevNullScreen != NULL) {
+      FreePool (Private->DevNullScreen);
+    }
 
     Size                    = (Row * (Column + 1)) * sizeof (CHAR16);
     Private->DevNullScreen  = AllocateZeroPool (Size);
@@ -1323,7 +1325,9 @@ DevNullTextOutSetMode (
       return EFI_OUT_OF_RESOURCES;
     }
 
-    FreePool (Private->DevNullAttributes);
+    if (Private->DevNullAttributes != NULL) {
+      FreePool (Private->DevNullAttributes);
+    }
 
     Size                        = Row * Column * sizeof (INT32);
     Private->DevNullAttributes  = AllocateZeroPool (Size);
diff --git a/EdkModulePkg/Universal/Console/Terminal/Dxe/Terminal.msa b/EdkModulePkg/Universal/Console/Terminal/Dxe/Terminal.msa
index 3403b35b75..8a281d763e 100644
--- a/EdkModulePkg/Universal/Console/Terminal/Dxe/Terminal.msa
+++ b/EdkModulePkg/Universal/Console/Terminal/Dxe/Terminal.msa
@@ -6,7 +6,7 @@
     <GuidValue>9E863906-A40F-4875-977F-5B93FF237FC6</GuidValue>
     <Version>1.0</Version>
     <Abstract>Component description file for Terminal module.</Abstract>
-    <Description>This driver installs Simple Text In/Out protocol for terminal devices.</Description>
+    <Description>This driver installs Simple Text In/Out protocol for terminal devices (serial devices or hotplug devices).</Description>
     <Copyright>Copyright (c) 2006 - 2007, Intel Corporation</Copyright>
     <License>All rights reserved. This program and the accompanying materials
       are licensed and made available under the terms and conditions of the BSD License