Refine code to make it more safely.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Eric Dong <eric.dong@intel.com>
Reviewed-by: Jaben Carsey <Jaben.carsey@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@15593 6f19259b-4bc3-4df7-8a09-765794883524

3 files changed, 44 insertions, 21 deletions

diff --git a/ShellPkg/Library/UefiShellDebug1CommandsLib/Bcfg.c b/ShellPkg/Library/UefiShellDebug1CommandsLib/Bcfg.c
index b19d8d9..483aa58 100644
--- a/ShellPkg/Library/UefiShellDebug1CommandsLib/Bcfg.c
+++ b/ShellPkg/Library/UefiShellDebug1CommandsLib/Bcfg.c
@@ -1,7 +1,7 @@
 /** @file

   Main file for bcfg shell Debug1 function.

 

-  Copyright (c) 2010 - 2013, Intel Corporation. All rights reserved.<BR>

+  Copyright (c) 2010 - 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

@@ -1027,12 +1027,14 @@ BcfgDisplayDumpDebug1(
         Buffer);

     if (Status == EFI_BUFFER_TOO_SMALL) {

       Buffer = AllocateZeroPool(BufferSize);

-      Status = gRT->GetVariable(

-          VariableName,

-          (EFI_GUID*)&gEfiGlobalVariableGuid,

-          NULL,

-          &BufferSize,

-          Buffer);

+      if (Buffer != NULL) {

+        Status = gRT->GetVariable(

+            VariableName,

+            (EFI_GUID*)&gEfiGlobalVariableGuid,

+            NULL,

+            &BufferSize,

+            Buffer);

+      }

     }

 

     if (EFI_ERROR(Status) || Buffer == NULL) {

@@ -1042,8 +1044,12 @@ BcfgDisplayDumpDebug1(
 

     if ((*(UINT16*)(Buffer+4)) != 0) {

       DevPath = AllocateZeroPool(*(UINT16*)(Buffer+4));

-      CopyMem(DevPath, Buffer+6+StrSize((CHAR16*)(Buffer+6)), *(UINT16*)(Buffer+4));

-      DevPathString = ConvertDevicePathToText(DevPath, TRUE, FALSE);

+      if (DevPath != NULL) {

+        CopyMem(DevPath, Buffer+6+StrSize((CHAR16*)(Buffer+6)), *(UINT16*)(Buffer+4));

+        DevPathString = ConvertDevicePathToText(DevPath, TRUE, FALSE);

+      } else {

+        DevPathString = NULL;

+      }

     } else {

       DevPath       = NULL;

       DevPathString = NULL;

@@ -1213,12 +1219,16 @@ ShellCommandRunBcfg (
         CurrentOperation.Order);

       if (Status == EFI_BUFFER_TOO_SMALL) {

         CurrentOperation.Order = AllocateZeroPool(Length+(4*sizeof(CurrentOperation.Order[0])));

-        Status = gRT->GetVariable(

-          CurrentOperation.Target == BcfgTargetBootOrder?(CHAR16*)L"BootOrder":(CHAR16*)L"DriverOrder",

-          (EFI_GUID*)&gEfiGlobalVariableGuid,

-          NULL,

-          &Length,

-          CurrentOperation.Order);

+        if (CurrentOperation.Order != NULL) {

+          Status = gRT->GetVariable(

+            CurrentOperation.Target == BcfgTargetBootOrder?(CHAR16*)L"BootOrder":(CHAR16*)L"DriverOrder",

+            (EFI_GUID*)&gEfiGlobalVariableGuid,

+            NULL,

+            &Length,

+            CurrentOperation.Order);

+        } else {

+          ShellStatus = SHELL_OUT_OF_RESOURCES;

+        }

       }

     }

 

diff --git a/ShellPkg/Library/UefiShellDebug1CommandsLib/Edit/FileBuffer.c b/ShellPkg/Library/UefiShellDebug1CommandsLib/Edit/FileBuffer.c
index 1795598..897700b 100644
--- a/ShellPkg/Library/UefiShellDebug1CommandsLib/Edit/FileBuffer.c
+++ b/ShellPkg/Library/UefiShellDebug1CommandsLib/Edit/FileBuffer.c
@@ -1,7 +1,7 @@
 /** @file

   Implements filebuffer interface functions.

 

-  Copyright (c) 2005 - 2012, 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

@@ -489,8 +489,9 @@ FileBufferPrintLine (
 

   CHAR16  *Buffer;

   UINTN   Limit;

-  CHAR16  PrintLine[200];

-  CHAR16  PrintLine2[250];

+  CHAR16  *PrintLine;

+  CHAR16  *PrintLine2;

+  UINTN   BufLen; 

 

   //

   // print start from correct character

@@ -502,13 +503,21 @@ FileBufferPrintLine (
     Limit = 0;

   }

 

-  StrnCpy (PrintLine, Buffer, MIN(MIN(Limit,MainEditor.ScreenSize.Column), 200));

+  BufLen = (MainEditor.ScreenSize.Column + 1) * sizeof (CHAR16);

+  PrintLine = AllocatePool (BufLen);

+  ASSERT (PrintLine != NULL);

+

+  StrnCpy (PrintLine, Buffer, MIN(Limit, MainEditor.ScreenSize.Column));

   for (; Limit < MainEditor.ScreenSize.Column; Limit++) {

     PrintLine[Limit] = L' ';

   }

 

   PrintLine[MainEditor.ScreenSize.Column] = CHAR_NULL;

-  ShellCopySearchAndReplace(PrintLine, PrintLine2,  250, L"%", L"^%", FALSE, FALSE);

+

+  PrintLine2 = AllocatePool (BufLen * 2);

+  ASSERT (PrintLine2 != NULL);

+

+  ShellCopySearchAndReplace(PrintLine, PrintLine2, BufLen * 2, L"%", L"^%", FALSE, FALSE);

 

   ShellPrintEx (

     0,

@@ -517,6 +526,9 @@ FileBufferPrintLine (
     PrintLine2

     );

 

+  FreePool (PrintLine);

+  FreePool (PrintLine2);

+

   return EFI_SUCCESS;

 }

 

diff --git a/ShellPkg/Library/UefiShellDebug1CommandsLib/Mm.c b/ShellPkg/Library/UefiShellDebug1CommandsLib/Mm.c
index 636acb2..29411df 100644
--- a/ShellPkg/Library/UefiShellDebug1CommandsLib/Mm.c
+++ b/ShellPkg/Library/UefiShellDebug1CommandsLib/Mm.c
@@ -1,7 +1,7 @@
 /** @file

   Main file for Mm 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

@@ -229,6 +229,7 @@ ShellCommandRunMm (
   SHELL_STATUS                    ShellStatus;

   CONST CHAR16                    *Temp;

 

+  Value         = 0;

   Address       = 0;

   PciEAddress   = 0;

   IoDev         = NULL;