From a91f1a0e88d07dd3817737f9886bc247cc737a4f Mon Sep 17 00:00:00 2001
From: "Bi, Dandan"
 <C:/Program Files (x86)/Git/o=Intel/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)/cn=Recipients/cn=Bi, Dandan08b>
Date: Tue, 5 Jul 2016 16:53:11 +0800
Subject: [PATCH] MdeModulePkg/BootMaintUi: Add error handling codes when
 AllocatePool fail

The AllocateCopyPool in function ExtractFileNameFromDevicePath
may return NULL, so need to do error handling. This patch is to
add error handling codes for function ExtractFileNameFromDevicePath
and its caller functions.

Cc: Eric Dong <eric.dong@intel.com>
Cc: Hao Wu <hao.a.wu@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Dandan Bi <dandan.bi@intel.com>
Reviewed-by: Eric Dong <eric.dong@intel.com>
Reviewed-by: Hao Wu <hao.a.wu@intel.com>
---
 .../BootMaintenance.c                         |  5 ++-
 .../BootMaintenanceManagerUiLib/BootOption.c  | 42 ++++++++++---------
 .../BootMaintenanceManagerUiLib/UpdatePage.c  | 14 ++++---
 3 files changed, 35 insertions(+), 26 deletions(-)

diff --git a/MdeModulePkg/Library/BootMaintenanceManagerUiLib/BootMaintenance.c b/MdeModulePkg/Library/BootMaintenanceManagerUiLib/BootMaintenance.c
index b35e938b40..393091f39a 100644
--- a/MdeModulePkg/Library/BootMaintenanceManagerUiLib/BootMaintenance.c
+++ b/MdeModulePkg/Library/BootMaintenanceManagerUiLib/BootMaintenance.c
@@ -379,6 +379,7 @@ ExtractFileNameFromDevicePath (
   String = UiDevicePathToStr(DevicePath);
   MatchString = String;
   LastMatch   = String;
+  FileName    = NULL;
 
   while(MatchString != NULL){
     LastMatch   = MatchString + 1;
@@ -387,7 +388,9 @@ ExtractFileNameFromDevicePath (
 
   Length = StrLen(LastMatch);
   FileName = AllocateCopyPool ((Length + 1) * sizeof(CHAR16), LastMatch);
-  *(FileName + Length) = 0;
+  if (FileName != NULL) {
+    *(FileName + Length) = 0;
+  }
 
   FreePool(String);
 
diff --git a/MdeModulePkg/Library/BootMaintenanceManagerUiLib/BootOption.c b/MdeModulePkg/Library/BootMaintenanceManagerUiLib/BootOption.c
index c660c73145..890728aff5 100644
--- a/MdeModulePkg/Library/BootMaintenanceManagerUiLib/BootOption.c
+++ b/MdeModulePkg/Library/BootMaintenanceManagerUiLib/BootOption.c
@@ -865,29 +865,33 @@ BootFromFile (
   EFI_BOOT_MANAGER_LOAD_OPTION BootOption;
   CHAR16                       *FileName;
 
+  FileName = NULL;
+
   FileName = ExtractFileNameFromDevicePath(FilePath);
-  EfiBootManagerInitializeLoadOption (
-    &BootOption,
-    0,
-    LoadOptionTypeBoot,
-    LOAD_OPTION_ACTIVE,
-    FileName,
-    FilePath,
-    NULL,
-    0
-    );
-  //
-  // Since current no boot from removable media directly is allowed */
-  //
-  gST->ConOut->ClearScreen (gST->ConOut);
+  if (FileName != NULL) {
+    EfiBootManagerInitializeLoadOption (
+      &BootOption,
+      0,
+      LoadOptionTypeBoot,
+      LOAD_OPTION_ACTIVE,
+      FileName,
+      FilePath,
+      NULL,
+      0
+      );
+    //
+    // Since current no boot from removable media directly is allowed */
+    //
+    gST->ConOut->ClearScreen (gST->ConOut);
 
-  BmmSetConsoleMode (FALSE);
-  EfiBootManagerBoot (&BootOption);
-  BmmSetConsoleMode (TRUE);
+    BmmSetConsoleMode (FALSE);
+    EfiBootManagerBoot (&BootOption);
+    BmmSetConsoleMode (TRUE);
 
-  FreePool(FileName);
+    FreePool(FileName);
 
-  EfiBootManagerFreeLoadOption (&BootOption);
+    EfiBootManagerFreeLoadOption (&BootOption);
+  }
 
   return FALSE;
 }
diff --git a/MdeModulePkg/Library/BootMaintenanceManagerUiLib/UpdatePage.c b/MdeModulePkg/Library/BootMaintenanceManagerUiLib/UpdatePage.c
index 13a29db9f4..9e79826a6a 100644
--- a/MdeModulePkg/Library/BootMaintenanceManagerUiLib/UpdatePage.c
+++ b/MdeModulePkg/Library/BootMaintenanceManagerUiLib/UpdatePage.c
@@ -1,7 +1,7 @@
 /** @file
 Dynamically update the pages.
 
-Copyright (c) 2004 - 2015, Intel Corporation. All rights reserved.<BR>
+Copyright (c) 2004 - 2016, 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
@@ -1020,17 +1020,19 @@ UpdateOptionPage(
   CHAR16                *String;
   EFI_STRING_ID         StringToken;
 
+  String = NULL;
+
   if (DevicePath != NULL){
     String = ExtractFileNameFromDevicePath(DevicePath);
-    StringToken = HiiSetString (CallbackData->BmmHiiHandle, 0, String, NULL);
-    FreePool(String);
-  } else {
+  }
+  if (String == NULL) {
     String = HiiGetString (CallbackData->BmmHiiHandle, STRING_TOKEN (STR_NULL_STRING), NULL);
     ASSERT (String != NULL);
-    StringToken =  HiiSetString (CallbackData->BmmHiiHandle, 0, String, NULL);
-    FreePool (String);
   }
 
+  StringToken = HiiSetString (CallbackData->BmmHiiHandle, 0, String, NULL);
+  FreePool (String);
+
   if(FormId == FORM_BOOT_ADD_ID){
     if (!CallbackData->BmmFakeNvData.BootOptionChanged) {
       ZeroMem (CallbackData->BmmFakeNvData.BootOptionalData, sizeof (CallbackData->BmmFakeNvData.BootOptionalData));