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Received-SPF: TempError (protection.outlook.com: error in processing during lookup of arm.com: DNS Timeout) X-Received: from nebula.arm.com (40.67.248.234) by AM5EUR03FT045.mail.protection.outlook.com (10.152.17.105) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256) id 15.20.2199.13 via Frontend Transport; Fri, 23 Aug 2019 10:58:18 +0000 X-Received: from AZ-NEU-EX03.Arm.com (10.251.24.31) by AZ-NEU-EX03.Arm.com (10.251.24.31) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1415.2; Fri, 23 Aug 2019 10:56:27 +0000 X-Received: from E107187.Arm.com (10.1.195.55) by mail.arm.com (10.251.24.31) with Microsoft SMTP Server id 15.1.1415.2 via Frontend Transport; Fri, 23 Aug 2019 10:56:26 +0000 From: "Sami Mujawar" To: CC: Sami Mujawar , , , , , Subject: [edk2-devel] [PATCH v1 17/19] ArmPlatformPkg: Fix UART divisor warning Date: Fri, 23 Aug 2019 11:55:37 +0100 Message-ID: <20190823105539.13260-18-sami.mujawar@arm.com> In-Reply-To: <20190823105539.13260-1-sami.mujawar@arm.com> References: <20190823105539.13260-1-sami.mujawar@arm.com> MIME-Version: 1.0 X-EOPAttributedMessage: 1 X-MS-Office365-Filtering-HT: Tenant X-Forefront-Antispam-Report-Untrusted: CIP:40.67.248.234;IPV:NLI;CTRY:IE;EFV:NLI;SFV:NSPM;SFS:(10009020)(4636009)(39860400002)(376002)(396003)(136003)(346002)(2980300002)(199004)(189003)(356004)(6666004)(486006)(81156014)(81166006)(53416004)(2351001)(476003)(126002)(2616005)(6916009)(44832011)(305945005)(50466002)(8676002)(19627235002)(54906003)(14444005)(16586007)(47776003)(316002)(50226002)(8936002)(36756003)(48376002)(4326008)(51416003)(53936002)(86362001)(478600001)(1076003)(70586007)(70206006)(186003)(336012)(26005)(5660300002)(76176011)(7696005)(63350400001)(446003)(2906002)(426003)(11346002)(63370400001)(46800400005);DIR:OUT;SFP:1101;SCL:1;SRVR:DB8PR08MB4955;H:nebula.arm.com;FPR:;SPF:TempError;LANG:en;PTR:InfoDomainNonexistent;A:1;MX:1; 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contact devel+owner@edk2.groups.io Reply-To: devel@edk2.groups.io,sami.mujawar@arm.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=groups.io; q=dns/txt; s=20140610; t=1566557918; bh=s/AedM6q4iLylithQJQ1t9Agu4H97BQ/iIkFhG/XEt4=; h=CC:Content-Type:Date:From:Reply-To:Subject:To; b=O8SnSnnfkC/dJyjDdWgpKivAR6suekf3v3jI9pvLt6hBho7ymc4LsensbZokYAVwhWa +55EunpP+e+uZ8HkTvinLkrYd/dWB3Xim5IEE/yRHCrZY1I3DSpNbl7DET91jI4uL/Bks hPFAidoCIfBdZw3wS40EpfNSbiCaJnT4SqQ= X-ZohoMail-DKIM: pass (identity @groups.io) Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The VS2017 compiler reports 'warning C4244: '=3D': conversion from 'UINT64' to 'UINT32', possible loss of data' for the calculation of the UART Divisor value. Fix this warning by adding appropriate typecast and a validation that ensures that the UART divisor value generated does not exceed MAX_UINT32. Signed-off-by: Sami Mujawar Reviewed-by: Alexei Fedorov Reviewed-by: Leif Lindholm Reviewed-by: Philippe Mathieu-Daude --- ArmPlatformPkg/Library/PL011UartLib/PL011UartLib.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/ArmPlatformPkg/Library/PL011UartLib/PL011UartLib.c b/ArmPlatfo= rmPkg/Library/PL011UartLib/PL011UartLib.c index 801990d9551a638c17d560d4226137b8a3ee47bb..2d3c279cce49304959953ec4a34= b50e09a7d0045 100644 --- a/ArmPlatformPkg/Library/PL011UartLib/PL011UartLib.c +++ b/ArmPlatformPkg/Library/PL011UartLib/PL011UartLib.c @@ -2,7 +2,7 @@ Serial I/O Port library functions with no library constructor/destructor =20 Copyright (c) 2008 - 2010, Apple Inc. All rights reserved.
- Copyright (c) 2011 - 2016, ARM Ltd. All rights reserved.
+ Copyright (c) 2011 - 2019, ARM Ltd. All rights reserved.
=20 SPDX-License-Identifier: BSD-2-Clause-Patent =20 @@ -78,6 +78,7 @@ PL011UartInitializePort ( UINT32 Integer; UINT32 Fractional; UINT32 HardwareFifoDepth; + UINT64 DivisorValue; =20 HardwareFifoDepth =3D (PL011_UARTPID2_VER (MmioRead32 (UartBase + UARTPI= D2)) \ > PL011_VER_R1P4) \ @@ -188,7 +189,12 @@ PL011UartInitializePort ( return RETURN_INVALID_PARAMETER; } =20 - Divisor =3D (UartClkInHz * 4) / *BaudRate; + DivisorValue =3D (((UINT64)UartClkInHz * 4) / *BaudRate); + if (DivisorValue > MAX_UINT32) { + return RETURN_INVALID_PARAMETER; + } + + Divisor =3D (UINT32)DivisorValue; Integer =3D Divisor >> FRACTION_PART_SIZE_IN_BITS; Fractional =3D Divisor & FRACTION_PART_MASK; } --=20 'Guid(CE165669-3EF3-493F-B85D-6190EE5B9759)' -=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D- Groups.io Links: You receive all messages sent to this group. View/Reply Online (#46279): https://edk2.groups.io/g/devel/message/46279 Mute This Topic: https://groups.io/mt/32999802/1787277 Group Owner: devel+owner@edk2.groups.io Unsubscribe: https://edk2.groups.io/g/devel/unsub [importer@patchew.org] -=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-