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ShellPkg/for: Fix potential null pointer deference

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When "FOR %a %a IN A B C" is executed,
CurrentScriptFile->CurrentCommand->Data is NULL.
But the code assumes it's not NULL and tries to
deference it.

The patch fixes this issue.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Ruiyu Ni <ruiyu.ni@intel.com>
Reviewed-by: Jaben Carsey <jaben.carsey@intel.com>
This commit is contained in:
Ruiyu Ni
2018-02-05 15:53:20 +08:00
parent e0db09cd1c
commit 7162fdb037
1 changed files with 4 additions and 2 deletions
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6
ShellPkg/Library/UefiShellLevel1CommandsLib/For.c
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@ -2,7 +2,7 @@
Main file for endfor and for shell level 1 functions. Main file for endfor and for shell level 1 functions.
(C) Copyright 2015 Hewlett-Packard Development Company, L.P.<BR> (C) Copyright 2015 Hewlett-Packard Development Company, L.P.<BR>
Copyright (c) 2009 - 2016, Intel Corporation. All rights reserved.<BR> Copyright (c) 2009 - 2018, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License 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 which accompanies this distribution. The full text of the license may be found at
@ -624,7 +624,9 @@ ShellCommandRunFor (
if (CurrentScriptFile != NULL && CurrentScriptFile->CurrentCommand != NULL) { if (CurrentScriptFile != NULL && CurrentScriptFile->CurrentCommand != NULL) {
Info = (SHELL_FOR_INFO*)CurrentScriptFile->CurrentCommand->Data; Info = (SHELL_FOR_INFO*)CurrentScriptFile->CurrentCommand->Data;
if (CurrentScriptFile->CurrentCommand->Reset) { if (CurrentScriptFile->CurrentCommand->Reset) {
Info->CurrentValue = (CHAR16*)Info->Set; if (Info != NULL) {
Info->CurrentValue = (CHAR16*)Info->Set;
}
FirstPass = TRUE; FirstPass = TRUE;
CurrentScriptFile->CurrentCommand->Reset = FALSE; CurrentScriptFile->CurrentCommand->Reset = FALSE;
} }