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ShellPkg/for: Fix potential null pointer deference
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1 /** @file
2 Main file for NULL named library for network2 shell command functions.
3
4 Copyright (c) 2016, Intel Corporation. All rights reserved. <BR>
5 This program and the accompanying materials are licensed and made available under
6 the terms and conditions of the BSD License which accompanies this distribution.
7 The full text of the license may be found at http://opensource.org/licenses/bsd-license.php
8
9 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
10 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
11
12 **/
13 #include "UefiShellNetwork2CommandsLib.h"
14
15 CONST CHAR16 gShellNetwork2FileName[] = L"ShellCommands";
16 EFI_HANDLE gShellNetwork2HiiHandle = NULL;
17
18 /**
19 return the file name of the help text file if not using HII.
20
21 @return The string pointer to the file name.
22 **/
23 CONST CHAR16*
24 EFIAPI
25 ShellCommandGetManFileNameNetwork2 (
26 VOID
27 )
28 {
29 return (gShellNetwork2FileName);
30 }
31
32 /**
33 Constructor for the Shell Network2 Commands library.
34
35 Install the handlers for Network2 UEFI Shell 2.0 profile commands.
36
37 @param ImageHandle The image handle of the process.
38 @param SystemTable The EFI System Table pointer.
39
40 @retval EFI_SUCCESS The shell command handlers were installed sucessfully.
41 @retval EFI_UNSUPPORTED The shell level required was not found.
42 **/
43 EFI_STATUS
44 EFIAPI
45 ShellNetwork2CommandsLibConstructor (
46 IN EFI_HANDLE ImageHandle,
47 IN EFI_SYSTEM_TABLE *SystemTable
48 )
49 {
50 gShellNetwork2HiiHandle = NULL;
51
52 //
53 // check our bit of the profiles mask
54 //
55 if ((PcdGet8(PcdShellProfileMask) & BIT4) == 0) {
56 return (EFI_SUCCESS);
57 }
58
59 gShellNetwork2HiiHandle = HiiAddPackages (&gShellNetwork2HiiGuid, gImageHandle, UefiShellNetwork2CommandsLibStrings, NULL);
60 if (gShellNetwork2HiiHandle == NULL) {
61 return (EFI_DEVICE_ERROR);
62 }
63 //
64 // install our shell command handlers
65 //
66 ShellCommandRegisterCommandName(L"ping6", ShellCommandRunPing6 , ShellCommandGetManFileNameNetwork2, 0, L"network2", TRUE , gShellNetwork2HiiHandle, STRING_TOKEN(STR_GET_HELP_PING6));
67 ShellCommandRegisterCommandName(L"ifconfig6",ShellCommandRunIfconfig6 , ShellCommandGetManFileNameNetwork2, 0, L"network2", TRUE , gShellNetwork2HiiHandle, STRING_TOKEN(STR_GET_HELP_IFCONFIG6));
68
69 return EFI_SUCCESS;
70
71 }
72
73 /**
74 Destructor for the library. free any resources.
75
76 @param ImageHandle The image handle of the process.
77 @param SystemTable The EFI System Table pointer.
78 **/
79 EFI_STATUS
80 EFIAPI
81 ShellNetwork2CommandsLibDestructor (
82 IN EFI_HANDLE ImageHandle,
83 IN EFI_SYSTEM_TABLE *SystemTable
84 )
85 {
86 if (gShellNetwork2HiiHandle != NULL) {
87 HiiRemovePackages(gShellNetwork2HiiHandle);
88 }
89 return EFI_SUCCESS;
90 }
91