ShellPkg/Dp: Add null pointer check

[mirror_edk2.git] / ShellPkg / Library / UefiShellDebug1CommandsLib / Dblk.c

diff --git a/ShellPkg/Library/UefiShellDebug1CommandsLib/Dblk.c b/ShellPkg/Library/UefiShellDebug1CommandsLib/Dblk.c
index 32e5917523cfe356b3a1be1372b0e60c14b99ae3..3632ca8a7a4eb1e16db1a252067b1741f5e551b2 100644 (file)
--- a/ShellPkg/Library/UefiShellDebug1CommandsLib/Dblk.c
+++ b/ShellPkg/Library/UefiShellDebug1CommandsLib/Dblk.c
@@ -2,7 +2,7 @@
   Main file for Dblk shell Debug1 function.\r
 \r
   (C) Copyright 2015 Hewlett-Packard Development Company, L.P.<BR>\r
-  Copyright (c) 2005 - 2011, Intel Corporation. All rights reserved.<BR>\r
+  Copyright (c) 2005 - 2017, Intel Corporation. All rights reserved.<BR>\r
   This program and the accompanying materials\r
   are licensed and made available under the terms and conditions of the BSD License\r
   which accompanies this distribution.  The full text of the license may be found at\r
@@ -37,6 +37,7 @@ DisplayTheBlocks(
   EFI_STATUS                Status;\r
   SHELL_STATUS              ShellStatus;\r
   UINT8                     *Buffer;\r
+  UINT8                     *OriginalBuffer;\r
   UINTN                     BufferSize;\r
 \r
   ShellStatus = SHELL_SUCCESS;\r
@@ -52,11 +53,17 @@ DisplayTheBlocks(
   }\r
 \r
   BufferSize = BlockIo->Media->BlockSize * BlockCount;\r
+  if(BlockIo->Media->IoAlign == 0) {\r
+    BlockIo->Media->IoAlign = 1;\r
+  }\r
+\r
   if (BufferSize > 0) {\r
-    Buffer     = AllocateZeroPool(BufferSize);\r
+    OriginalBuffer = AllocateZeroPool(BufferSize + BlockIo->Media->IoAlign);\r
+    Buffer         = ALIGN_POINTER (OriginalBuffer,BlockIo->Media->IoAlign);\r
   } else {\r
     ShellPrintEx(-1,-1,L"  BlockSize: 0x%08x, BlockCount: 0x%08x\r\n", BlockIo->Media->BlockSize, BlockCount);\r
-    Buffer    = NULL;\r
+    OriginalBuffer = NULL;\r
+    Buffer         = NULL;\r
   }\r
 \r
   Status = BlockIo->ReadBlocks(BlockIo, BlockIo->Media->MediaId, Lba, BufferSize, Buffer);\r
@@ -78,8 +85,8 @@ DisplayTheBlocks(
     ShellStatus = SHELL_DEVICE_ERROR;\r
   }\r
 \r
-  if (Buffer != NULL) {\r
-    FreePool(Buffer);\r
+  if (OriginalBuffer != NULL) {\r
+    FreePool (OriginalBuffer);\r
   }\r
 \r
   gBS->CloseProtocol(BlockIoHandle, &gEfiBlockIoProtocolGuid, gImageHandle, NULL);\r