<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=us-ascii"> <style type="text/css" style="display:none;"> P {margin-top:0;margin-bottom:0;} </style> </head> <body dir="ltr"> <div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"> Reviewed-by: Alexei Fedorov <Alexei.Fedorov@arm.com> </div> <div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"> </div> <div id="Signature"> <div id="divtagdefaultwrapper" dir="ltr" style="font-size:12pt; color:#000000; font-family:Calibri,Helvetica,sans-serif"> Alexei </div> </div> <div id="appendonsend"></div> <hr style="display:inline-block;width:98%" tabindex="-1"> <div id="divRplyFwdMsg" dir="ltr">From: Sami Mujawar <sami.mujawar@arm.com> Sent: 23 August 2019 11:55 To: devel@edk2.groups.io <devel@edk2.groups.io> Cc: Sami Mujawar <Sami.Mujawar@arm.com>; Alexei Fedorov <Alexei.Fedorov@arm.com>; ard.biesheuvel@linaro.org <ard.biesheuvel@linaro.org>; leif.lindholm@linaro.org <leif.lindholm@linaro.org>; Matteo Carlini <Matteo.Carlini@arm.com>; michael.d.kinney@intel.com <michael.d.kinney@intel.com>; liming.gao@intel.com <liming.gao@intel.com>; nd <nd@arm.com> Subject: [PATCH v1 19/19] MdePkg: Initialise VA_LIST variables before use <div> </div> </div> <div class="BodyFragment"> <div class="PlainText">The VS2017 compiler reports 'warning C6001: Using uninitialized memory 'Marker'.' for VA_LIST variables. To fix this issue declare a VA_LIST global variable and use this to initialise VA_LIST variables before use. Note: The VA_LIST cannot be assigned a NULL value because some compilers define VA_LIST to be a structure. Signed-off-by: Sami Mujawar <sami.mujawar@arm.com> --- MdePkg/Library/BaseLib/SwitchStack.c | 9 +++++++++ MdePkg/Library/BasePrintLib/PrintLib.c | 5 +++++ MdePkg/Library/BasePrintLib/PrintLibInternal.c | 9 +++++++++ 3 files changed, 23 insertions(+) diff --git a/MdePkg/Library/BaseLib/SwitchStack.c b/MdePkg/Library/BaseLib/SwitchStack.c index cb9f69f1eaceba690b48e9ca6b8a9af2e348bddd..e1bb524819b3de3521c5461ce681aa3a6c186f2c 100644 --- a/MdePkg/Library/BaseLib/SwitchStack.c +++ b/MdePkg/Library/BaseLib/SwitchStack.c @@ -2,12 +2,20 @@ Switch Stack functions. Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved. + Copyright (c) 2019, ARM Ltd. All rights reserved. SPDX-License-Identifier: BSD-2-Clause-Patent **/ #include "BaseLibInternals.h" +// +// Declare a VA_LIST global variable that is used to initialise VA_LIST +// variables before use. The VA_LIST cannot be assigned a NULL value +// because some compilers define VA_LIST to be a structure. +// +STATIC VA_LIST gNullVaList; + /** Transfers control to a function starting with a new stack. @@ -57,6 +65,7 @@ SwitchStack ( // ASSERT (((UINTN)NewStack & (CPU_STACK_ALIGNMENT - 1)) == 0); + Marker = gNullVaList; VA_START (Marker, NewStack); InternalSwitchStack (EntryPoint, Context1, Context2, NewStack, Marker); diff --git a/MdePkg/Library/BasePrintLib/PrintLib.c b/MdePkg/Library/BasePrintLib/PrintLib.c index af771652e4b0aebd616973ba1089ae5bc2b6f0c0..67c5f3dd547cea5447075ef88d697879883ba5ab 100644 --- a/MdePkg/Library/BasePrintLib/PrintLib.c +++ b/MdePkg/Library/BasePrintLib/PrintLib.c @@ -3,6 +3,7 @@ Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved. Portions copyright (c) 2008 - 2009, Apple Inc. All rights reserved. + Copyright (c) 2019, ARM Ltd. All rights reserved. SPDX-License-Identifier: BSD-2-Clause-Patent **/ @@ -177,6 +178,7 @@ UnicodeSPrint ( VA_LIST Marker; UINTN NumberOfPrinted; + Marker = gNullVaList; VA_START (Marker, FormatString); NumberOfPrinted = UnicodeVSPrint (StartOfBuffer, BufferSize, FormatString, Marker); VA_END (Marker); @@ -337,6 +339,7 @@ UnicodeSPrintAsciiFormat ( VA_LIST Marker; UINTN NumberOfPrinted; + Marker = gNullVaList; VA_START (Marker, FormatString); NumberOfPrinted = UnicodeVSPrintAsciiFormat (StartOfBuffer, BufferSize, FormatString, Marker); VA_END (Marker); @@ -614,6 +617,7 @@ AsciiSPrint ( VA_LIST Marker; UINTN NumberOfPrinted; + Marker = gNullVaList; VA_START (Marker, FormatString); NumberOfPrinted = AsciiVSPrint (StartOfBuffer, BufferSize, FormatString, Marker); VA_END (Marker); @@ -774,6 +778,7 @@ AsciiSPrintUnicodeFormat ( VA_LIST Marker; UINTN NumberOfPrinted; + Marker = gNullVaList; VA_START (Marker, FormatString); NumberOfPrinted = AsciiVSPrintUnicodeFormat (StartOfBuffer, BufferSize, FormatString, Marker); VA_END (Marker); diff --git a/MdePkg/Library/BasePrintLib/PrintLibInternal.c b/MdePkg/Library/BasePrintLib/PrintLibInternal.c index b6ec5ac4fbb98982f8ccaf3908c2a91ce583e31e..11392f2a5d12eb059611c3ff77b27b602f9b9a40 100644 --- a/MdePkg/Library/BasePrintLib/PrintLibInternal.c +++ b/MdePkg/Library/BasePrintLib/PrintLibInternal.c @@ -2,12 +2,20 @@ Print Library internal worker functions. Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved. + Copyright (c) 2019, ARM Ltd. All rights reserved. SPDX-License-Identifier: BSD-2-Clause-Patent **/ #include "PrintLibInternal.h" +// +// Declare a VA_LIST global variable that is used to initialise VA_LIST +// variables before use. The VA_LIST cannot be assigned a NULL value +// because some compilers define VA_LIST to be a structure. +// +extern VA_LIST gNullVaList; + #define WARNING_STATUS_NUMBER 5 #define ERROR_STATUS_NUMBER 33 @@ -1256,6 +1264,7 @@ BasePrintLibSPrint ( VA_LIST Marker; UINTN NumberOfPrinted; + Marker = gNullVaList; VA_START (Marker, FormatString); NumberOfPrinted = BasePrintLibSPrintMarker (StartOfBuffer, BufferSize, Flags, FormatString, Marker, NULL); VA_END (Marker); -- 'Guid(CE165669-3EF3-493F-B85D-6190EE5B9759)' </div> </div> IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. 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