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From: "Chiu, Chasel" <chasel.chiu@intel.com>
To: "Zhang, Shenglei" <shenglei.zhang@intel.com>, "devel@edk2.groups.io"
	<devel@edk2.groups.io>
CC: "Kubacki, Michael A" <michael.a.kubacki@intel.com>, "Desimone, Nathaniel
 L" <nathaniel.l.desimone@intel.com>, "Gao, Liming" <liming.gao@intel.com>
Subject: Re: [PATCH v2 1/2] MinPlatformPkg/AcpiTables: Initialize variables before used
Thread-Topic: [PATCH v2 1/2] MinPlatformPkg/AcpiTables: Initialize variables
 before used
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Date: Thu, 12 Sep 2019 04:05:52 +0000
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Reviewed-by: Chasel Chiu <chasel.chiu@intel.com>

> -----Original Message-----
> From: Zhang, Shenglei
> Sent: Thursday, September 12, 2019 11:27 AM
> To: devel@edk2.groups.io
> Cc: Kubacki, Michael A <michael.a.kubacki@intel.com>; Chiu, Chasel
> <chasel.chiu@intel.com>; Desimone, Nathaniel L
> <nathaniel.l.desimone@intel.com>; Gao, Liming <liming.gao@intel.com>
> Subject: [PATCH v2 1/2] MinPlatformPkg/AcpiTables: Initialize variables
> before used
>=20
> MadtStructs, NewMadtTable and MaxMadtStructCount are not initialized
> before used or at the proper place. So assign values to them at the
> beginning and change the logic when freeing MadtStructs and
> NewMadtTable.
>=20
> Cc: Michael Kubacki <michael.a.kubacki@intel.com>
> Cc: Chasel Chiu <chasel.chiu@intel.com>
> Cc: Nate DeSimone <nathaniel.l.desimone@intel.com>
> Cc: Liming Gao <liming.gao@intel.com>
> Signed-off-by: Shenglei Zhang <shenglei.zhang@intel.com>
> ---
>  .../Acpi/AcpiTables/AcpiPlatform.c            | 21 +++++++++++--------
>  1 file changed, 12 insertions(+), 9 deletions(-)
>=20
> diff --git a/Platform/Intel/MinPlatformPkg/Acpi/AcpiTables/AcpiPlatform.c
> b/Platform/Intel/MinPlatformPkg/Acpi/AcpiTables/AcpiPlatform.c
> index 5eb72792..2cc55ee8 100644
> --- a/Platform/Intel/MinPlatformPkg/Acpi/AcpiTables/AcpiPlatform.c
> +++ b/Platform/Intel/MinPlatformPkg/Acpi/AcpiTables/AcpiPlatform.c
> @@ -1,7 +1,7 @@
>  /** @file
>    ACPI Platform Driver
>=20
> -Copyright (c) 2017, Intel Corporation. All rights reserved.<BR>
> +Copyright (c) 2017-2019, Intel Corporation. All rights reserved.<BR>
>  SPDX-License-Identifier: BSD-2-Clause-Patent
>=20
>  **/
> @@ -867,13 +867,15 @@ InstallMadtFromScratch (
>    UINT32
> PcIoApicMask;
>    UINTN
> PcIoApicIndex;
>=20
> +  MadtStructs =3D NULL;
> +  NewMadtTable =3D NULL;
> +  MaxMadtStructCount =3D 0;
> +
>    DetectApicIdMap();
>=20
>    // Call for Local APIC ID Reorder
>    SortCpuLocalApicInTable ();
>=20
> -  NewMadtTable =3D NULL;
> -
>    MaxMadtStructCount =3D (UINT32) (
>      MAX_CPU_NUM +    // processor local APIC structures
>      MAX_CPU_NUM +    // processor local x2APIC structures
> @@ -1115,14 +1117,15 @@ Done:
>    //
>    // Free memory
>    //
> -  for (MadtStructsIndex =3D 0; MadtStructsIndex < MaxMadtStructCount;
> MadtStructsIndex++) {
> -    if (MadtStructs[MadtStructsIndex] !=3D NULL) {
> -      FreePool (MadtStructs[MadtStructsIndex]);
> +  if (MadtStructs !=3D NULL){
> +    for (MadtStructsIndex =3D 0; MadtStructsIndex < MaxMadtStructCount;
> MadtStructsIndex++) {
> +      if (MadtStructs[MadtStructsIndex] !=3D NULL) {
> +        FreePool (MadtStructs[MadtStructsIndex]);
> +      }
>      }
> +    FreePool (MadtStructs);
>    }
> -
> -  FreePool (MadtStructs);
> -
> +
>    if (NewMadtTable !=3D NULL) {
>      FreePool (NewMadtTable);
>    }
> --
> 2.18.0.windows.1