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>

diff --git a/SourceLevelDebugPkg/Library/DebugCommunicationLibUsb3/DebugCommunicationLibUsb3Dxe.c b/SourceLevelDebugPkg/Library/DebugCommunicationLibUsb3/DebugCommunicationLibUsb3Dxe.c
index 1582b9a8d6deb3b992dbac46357a75a82def1008..29cec56f39dcd5cab307e49e7f17200918914e0e 100644 (file)
--- a/SourceLevelDebugPkg/Library/DebugCommunicationLibUsb3/DebugCommunicationLibUsb3Dxe.c
+++ b/SourceLevelDebugPkg/Library/DebugCommunicationLibUsb3/DebugCommunicationLibUsb3Dxe.c
@@ -443,7 +443,7 @@ DebugCommunicationUsb3DxeConstructor (
   }\r
 \r
 Done:\r
   }\r
 \r
 Done:\r

-  if (mUsb3Instance->Ready && (mUsb3Instance->PciIoEvent == 0)) {\r
+  if ((mUsb3Instance != NULL) && mUsb3Instance->Ready && (mUsb3Instance->PciIoEvent == 0)) {\r

     Status = Usb3NamedEventListen (\r
                &gEfiPciIoProtocolGuid,\r
                TPL_NOTIFY,\r
     Status = Usb3NamedEventListen (\r
                &gEfiPciIoProtocolGuid,\r
                TPL_NOTIFY,\r