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Fix overflow issue in TcgProtocol 

Signed-off-by: Chao Zhang <chao.b.zhang@intel.com>
Reviewed-by  : Yao Jiewen <jiewen.yao@intel.com>
Reviewed-by  : Dong Guo   <guo.dong@intel.com>


git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@14396 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
Chao Zhang 2013-06-06 00:39:41 +00:00 committed by czhang46
parent 5e2fd93720
commit 443bd74473
1 changed files with 10 additions and 3 deletions
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13
SecurityPkg/Tcg/TcgDxe/TpmComm.c
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@ -1,7 +1,7 @@
/** @file
Utility functions used by TPM Dxe driver.
Copyright (c) 2005 - 2010, Intel Corporation. All rights reserved.<BR>
Copyright (c) 2005 - 2013, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials
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
@ -144,10 +144,17 @@ TpmCommLogEvent (
IN UINT8 *NewEventData
)
{
UINT32 NewLogSize;
UINTN NewLogSize;
//
// Prevent Event Overflow
//
if (NewEventHdr->EventSize > (UINTN)(~0) - sizeof (*NewEventHdr)) {
return EFI_OUT_OF_RESOURCES;
}
NewLogSize = sizeof (*NewEventHdr) + NewEventHdr->EventSize;
if (NewLogSize + *LogSize > MaxSize) {
if (NewLogSize > MaxSize - *LogSize) {
return EFI_OUT_OF_RESOURCES;
}