ShellPkg/Dp: Add null pointer check

[mirror_edk2.git] / ShellPkg / Library / UefiShellDriver1CommandsLib / Unload.c

/** @file\r
  Main file for Unload shell Driver1 function.\r
\r
  (C) Copyright 2015 Hewlett-Packard Development Company, L.P.<BR>\r
  Copyright (c) 2010 - 2014, 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
  http://opensource.org/licenses/bsd-license.php\r
\r
  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
\r
**/\r
\r
#include "UefiShellDriver1CommandsLib.h"\r
\r
/**\r
  Function to dump LoadedImage info from TheHandle.\r
\r
  @param[in] TheHandle              The handle to dump info from.\r
\r
  @retval EFI_SUCCESS               The info was dumped.\r
  @retval EFI_INVALID_PARAMETER     The handle did not have LoadedImage\r
**/\r
EFI_STATUS\r
DumpLoadedImageProtocolInfo (\r
  IN EFI_HANDLE   TheHandle\r
  )\r
{\r
  CHAR16 *TheString;\r
\r
  TheString = GetProtocolInformationDump(TheHandle, &gEfiLoadedImageProtocolGuid, TRUE);\r
  \r
  ShellPrintEx(-1, -1, L"%s", TheString);\r
\r
  SHELL_FREE_NON_NULL(TheString);\r
  \r
  return (EFI_SUCCESS);\r
}\r
\r
STATIC CONST SHELL_PARAM_ITEM ParamList[] = {\r
  {L"-n", TypeFlag},\r
  {L"-v", TypeFlag},\r
  {L"-verbose", TypeFlag},\r
  {NULL, TypeMax}\r
  };\r
\r
/**\r
  Function for 'unload' command.\r
\r
  @param[in] ImageHandle  Handle to the Image (NULL if Internal).\r
  @param[in] SystemTable  Pointer to the System Table (NULL if Internal).\r
**/\r
SHELL_STATUS\r
EFIAPI\r
ShellCommandRunUnload (\r
  IN EFI_HANDLE        ImageHandle,\r
  IN EFI_SYSTEM_TABLE  *SystemTable\r
  )\r
{\r
  EFI_STATUS            Status;\r
  LIST_ENTRY            *Package;\r
  CHAR16                *ProblemParam;\r
  SHELL_STATUS          ShellStatus;\r
  EFI_HANDLE            TheHandle;\r
  CONST CHAR16          *Param1;\r
  SHELL_PROMPT_RESPONSE *Resp;\r
  UINT64                Value;\r
\r
  ShellStatus         = SHELL_SUCCESS;\r
  Package             = NULL;\r
  Resp                = NULL;\r
  Value               = 0;\r
  TheHandle           = NULL;\r
\r
  //\r
  // initialize the shell lib (we must be in non-auto-init...)\r
  //\r
  Status = ShellInitialize();\r
  ASSERT_EFI_ERROR(Status);\r
\r
  //\r
  // parse the command line\r
  //\r
  Status = ShellCommandLineParse (ParamList, &Package, &ProblemParam, TRUE);\r
  if (EFI_ERROR(Status)) {\r
    if (Status == EFI_VOLUME_CORRUPTED && ProblemParam != NULL) {\r
      ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_GEN_PROBLEM), gShellDriver1HiiHandle,L"unload", ProblemParam);  \r
      FreePool(ProblemParam);\r
      ShellStatus = SHELL_INVALID_PARAMETER;\r
    } else {\r
      ASSERT(FALSE);\r
    }\r
  } else {\r
    if (ShellCommandLineGetCount(Package) > 2){\r
      //\r
      // error for too many parameters\r
      //\r
      ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_GEN_TOO_MANY), gShellDriver1HiiHandle, L"unload");  \r
      ShellStatus = SHELL_INVALID_PARAMETER;\r
    } else if (ShellCommandLineGetCount(Package) < 2) {\r
      ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_GEN_TOO_FEW), gShellDriver1HiiHandle, L"unload");  \r
      ShellStatus = SHELL_INVALID_PARAMETER;\r
    } else {\r
      Param1    = ShellCommandLineGetRawValue(Package, 1);\r
      if (Param1 != NULL) {\r
        Status    = ShellConvertStringToUint64(Param1, &Value, TRUE, FALSE);\r
        TheHandle = ConvertHandleIndexToHandle((UINTN)Value);\r
      }\r
\r
      if (EFI_ERROR(Status) || Param1 == NULL || TheHandle == NULL){\r
        ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_GEN_INV_HANDLE), gShellDriver1HiiHandle, L"unload", Param1);  \r
        ShellStatus = SHELL_INVALID_PARAMETER;\r
      } else {\r
        ASSERT(TheHandle != NULL);\r
        if (ShellCommandLineGetFlag(Package, L"-v") || ShellCommandLineGetFlag(Package, L"-verbose")) {\r
          DumpLoadedImageProtocolInfo(TheHandle);\r
        }\r
        \r
        if (!ShellCommandLineGetFlag(Package, L"-n")) {\r
          Status = ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN(STR_UNLOAD_CONF), gShellDriver1HiiHandle, (UINTN)TheHandle);\r
          Status = ShellPromptForResponse(ShellPromptResponseTypeYesNo, NULL, (VOID**)&Resp);\r
        }\r
        if (ShellCommandLineGetFlag(Package, L"-n") || (Resp != NULL && *Resp == ShellPromptResponseYes)) {\r
          Status = gBS->UnloadImage(TheHandle);\r
          ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_HANDLE_RESULT), gShellDriver1HiiHandle, L"Unload", (UINTN)TheHandle, Status);\r
        }\r
        SHELL_FREE_NON_NULL(Resp);\r
      }\r
    }\r
  }\r
  if (ShellStatus == SHELL_SUCCESS) {\r
    if (Status == EFI_SECURITY_VIOLATION) {\r
      ShellStatus = SHELL_SECURITY_VIOLATION;\r
    } else if (Status == EFI_INVALID_PARAMETER) {\r
      ShellStatus = SHELL_INVALID_PARAMETER;\r
    } else if (EFI_ERROR(Status)) {\r
      ShellStatus = SHELL_NOT_FOUND;\r
    }\r
  }\r
\r
  if (Package != NULL) {\r
    ShellCommandLineFreeVarList(Package);\r
  }\r
\r
  return (ShellStatus);\r
}\r