From 6ef394ffe29bbc67038fc16ed540bfe6eed10e16 Mon Sep 17 00:00:00 2001
From: Star Zeng <star.zeng@intel.com>
Date: Fri, 9 Feb 2018 10:25:12 +0800
Subject: [PATCH] SourceLevelDebugPkg DebugUsb3: Check mUsb3Instance before
 dereferencing it

Cc: Ruiyu Ni <ruiyu.ni@intel.com>
Cc: Hao Wu <hao.a.wu@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Hao Wu <hao.a.wu@intel.com>
---
 .../DebugCommunicationLibUsb3/DebugCommunicationLibUsb3Dxe.c    | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/SourceLevelDebugPkg/Library/DebugCommunicationLibUsb3/DebugCommunicationLibUsb3Dxe.c b/SourceLevelDebugPkg/Library/DebugCommunicationLibUsb3/DebugCommunicationLibUsb3Dxe.c
index 1582b9a8d6..29cec56f39 100644
--- a/SourceLevelDebugPkg/Library/DebugCommunicationLibUsb3/DebugCommunicationLibUsb3Dxe.c
+++ b/SourceLevelDebugPkg/Library/DebugCommunicationLibUsb3/DebugCommunicationLibUsb3Dxe.c
@@ -443,7 +443,7 @@ DebugCommunicationUsb3DxeConstructor (
   }
 
 Done:
-  if (mUsb3Instance->Ready && (mUsb3Instance->PciIoEvent == 0)) {
+  if ((mUsb3Instance != NULL) && mUsb3Instance->Ready && (mUsb3Instance->PciIoEvent == 0)) {
     Status = Usb3NamedEventListen (
                &gEfiPciIoProtocolGuid,
                TPL_NOTIFY,
-- 
2.39.2