From 1d5b25b7159f87612181c00b8be9ae6404d37168 Mon Sep 17 00:00:00 2001
From: eric_tian <eric_tian@6f19259b-4bc3-4df7-8a09-765794883524>
Date: Tue, 11 Aug 2009 05:24:12 +0000
Subject: [PATCH] add condition judgment to avoid accessing NULL address if not
 found existing variable.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@9038 6f19259b-4bc3-4df7-8a09-765794883524
---
 MdeModulePkg/Universal/Variable/EmuRuntimeDxe/EmuVariable.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/MdeModulePkg/Universal/Variable/EmuRuntimeDxe/EmuVariable.c b/MdeModulePkg/Universal/Variable/EmuRuntimeDxe/EmuVariable.c
index dddc143751..228d7d8cff 100644
--- a/MdeModulePkg/Universal/Variable/EmuRuntimeDxe/EmuVariable.c
+++ b/MdeModulePkg/Universal/Variable/EmuRuntimeDxe/EmuVariable.c
@@ -618,7 +618,7 @@ UpdateVariable (
   UINTN                   VarDataOffset;
   UINTN                   VarSize;
   VARIABLE_GLOBAL         *Global;
-  UINTN                               NonVolatileVarableStoreSize;
+  UINTN                   NonVolatileVarableStoreSize;
 
   Global = &mVariableModuleGlobal->VariableGlobal[Physical];
 
@@ -767,7 +767,9 @@ UpdateVariable (
   //
   // Mark the old variable as deleted
   //
-  Variable->CurrPtr->State &= VAR_DELETED;
+  if (Variable->CurrPtr != NULL) {
+    Variable->CurrPtr->State &= VAR_DELETED;
+  }
 
   UpdateVariableInfo (VariableName, VendorGuid, Variable->Volatile, FALSE, TRUE, FALSE, FALSE);
 
-- 
2.39.2