From 24c6962d0988132c0a40dcc15f824dac02ef74b5 Mon Sep 17 00:00:00 2001
From: Hao Wu <hao.a.wu@intel.com>
Date: Mon, 27 Feb 2017 09:33:00 +0800
Subject: [PATCH] ShellPkg/UefiDpLib: Add check to avoid NULL pointer deference

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Hao Wu <hao.a.wu@intel.com>
Reviewed-by: Star Zeng <star.zeng@intel.com>
---
 ShellPkg/Library/UefiDpLib/Dp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ShellPkg/Library/UefiDpLib/Dp.c b/ShellPkg/Library/UefiDpLib/Dp.c
index 33f69a0c14..35ead751be 100644
--- a/ShellPkg/Library/UefiDpLib/Dp.c
+++ b/ShellPkg/Library/UefiDpLib/Dp.c
@@ -272,7 +272,7 @@ ShellCommandRunDp (
   //      EndCount = Value counter counts to before it needs to be reset
   //
   Status = EfiGetSystemConfigurationTable (&gPerformanceProtocolGuid, (VOID **) &PerformanceProperty);
-  if (EFI_ERROR (Status)) {
+  if (EFI_ERROR (Status) || (PerformanceProperty == NULL)) {
     ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_PERF_PROPERTY_NOT_FOUND), gDpHiiHandle);
     goto Done;
   }