Add the comment for function 'IsValidSplit' in 'Shell.c'. Add code to check whether pointer 'DataBuffer' in 'DmpStore.c' is NULL before used.

Signed-off-by: Shumin Qiu <shumin.qiu@intel.com>
Reviewed-by: Jaben Carsey <Jaben.carsey@intel.com>




git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@15051 6f19259b-4bc3-4df7-8a09-765794883524

ShellPkg/Library/UefiShellDebug1CommandsLib/DmpStore.c

@@ -1,7 +1,7 @@
 /** @file
   Main file for DmpStore shell Debug1 function.
 
-  Copyright (c) 2005 - 2013, Intel Corporation. All rights reserved.<BR>
+  Copyright (c) 2005 - 2014, Intel Corporation. All rights reserved.<BR>
   This program and the accompanying materials
   are licensed and made available under the terms and conditions of the BSD License
   which accompanies this distribution.  The full text of the license may be found at
@@ -173,7 +173,7 @@ CascadeProcessVariables (
       //
       // Last error check then print this variable out.
       //
-      if (!EFI_ERROR(Status)) {
+      if (!EFI_ERROR(Status) && DataBuffer != NULL) {
         RetString = GetAttrType(Atts);
         ShellPrintHiiEx(
           -1,