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OvmfPkg:Fix VS2012 build failure 

Initialize local variable to suppress warning C4701/C4703:
potentially uninitialized local variable/pointer variable.

1.In VirtualMemory.c:
Read of "PageMapLevel4Entry" in SetMemoryEncDe() is only
reached when "PageMapLevel4Entry" is got correctly.

2.In VirtioBlk.c:
Reads (dereferences) of "BufferMapping" and "BufferDeviceAddress"
in SynchronousRequest() are only reached if "BufferSize > 0" *and*
we map the data buffer successfully.

3.In VirtioScsi.c:
Reads (dereferences) of "InDataMapping" and "InDataDeviceAddress",
in VirtioScsiPassThru() are only reached if
"Packet->InTransferLength > 0" on input, *and* we map the
input buffer successfully. The similar reason for "OutDataMapping"
and "OutDataDeviceAddress".

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Dandan Bi <dandan.bi@intel.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
This commit is contained in:
Dandan Bi 2018-03-23 11:21:56 +08:00 committed by Liming Gao
parent d1b777440b
commit 699a2c30cb
3 changed files with 24 additions and 3 deletions
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7
OvmfPkg/Library/BaseMemEncryptSevLib/X64/VirtualMemory.c
View File

@ -2,7 +2,7 @@
Virtual Memory Management Services to set or clear the memory encryption bit
Copyright (c) 2006 - 2016, Intel Corporation. All rights reserved.<BR>
Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
Copyright (c) 2017, AMD Incorporated. All rights reserved.<BR>
This program and the accompanying materials are licensed and made available
@ -596,6 +596,11 @@ SetMemoryEncDec (
BOOLEAN IsWpEnabled;
RETURN_STATUS Status;
//
// Set PageMapLevel4Entry to suppress incorrect compiler/analyzer warnings.
//
PageMapLevel4Entry = NULL;
DEBUG ((
DEBUG_VERBOSE,
"%a:%a: Cr3Base=0x%Lx Physical=0x%Lx Length=0x%Lx Mode=%a CacheFlush=%u\n",

9
OvmfPkg/VirtioBlkDxe/VirtioBlk.c
View File

@ -11,7 +11,7 @@
synchronous requests and EFI_BLOCK_IO_PROTOCOL for now.
Copyright (C) 2012, Red Hat, Inc.
Copyright (c) 2012 - 2016, Intel Corporation. All rights reserved.<BR>
Copyright (c) 2012 - 2018, Intel Corporation. All rights reserved.<BR>
Copyright (c) 2017, AMD Inc, All rights reserved.<BR>
This program and the accompanying materials are licensed and made available
@ -264,6 +264,13 @@ SynchronousRequest (
BlockSize = Dev->BlockIoMedia.BlockSize;
//
// Set BufferMapping and BufferDeviceAddress to suppress incorrect
// compiler/analyzer warnings.
//
BufferMapping = NULL;
BufferDeviceAddress = 0;
//
// ensured by VirtioBlkInit()
//

11
OvmfPkg/VirtioScsiDxe/VirtioScsi.c
View File

@ -26,7 +26,7 @@
unreasonable for now.
Copyright (C) 2012, Red Hat, Inc.
Copyright (c) 2012 - 2014, Intel Corporation. All rights reserved.<BR>
Copyright (c) 2012 - 2018, Intel Corporation. All rights reserved.<BR>
Copyright (c) 2017, AMD Inc, All rights reserved.<BR>
This program and the accompanying materials are licensed and made available
@ -455,6 +455,15 @@ VirtioScsiPassThru (
UINTN InDataNumPages;
BOOLEAN OutDataBufferIsMapped;
//
// Set InDataMapping,OutDataMapping,InDataDeviceAddress and OutDataDeviceAddress to
// suppress incorrect compiler/analyzer warnings.
//
InDataMapping = NULL;
OutDataMapping = NULL;
InDataDeviceAddress = 0;
OutDataDeviceAddress = 0;
ZeroMem ((VOID*) &Request, sizeof (Request));
Dev = VIRTIO_SCSI_FROM_PASS_THRU (This);