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IntelSiliconPkg IntelVTdDxe: Fix potential NULL pointer dereference 

The implementation of MdeModulePkg\Universal\Acpi\AcpiTableDxe reserves
first entry of RSDT/XSDT to FADT, the first entry value is 0 when FADT
is not installed. So the RSDT/XSDT parsing code should check the entry
value first before checking the table signature.

Cc: Jiewen Yao <jiewen.yao@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>
This commit is contained in:
Star Zeng 2018-01-15 10:26:07 +08:00
parent b721aa749b
commit 01bd1c98fa
1 changed files with 3 additions and 3 deletions
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6
IntelSiliconPkg/Feature/VTd/IntelVTdDxe/DmarAcpiTable.c
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@ -1,6 +1,6 @@
/** @file
Copyright (c) 2017, Intel Corporation. All rights reserved.<BR>
Copyright (c) 2017 - 2018, 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
@ -889,7 +889,7 @@ ScanTableInRSDT (
EntryPtr = &Rsdt->Entry;
for (Index = 0; Index < EntryCount; Index ++, EntryPtr ++) {
Table = (EFI_ACPI_DESCRIPTION_HEADER*)((UINTN)(*EntryPtr));
if (Table->Signature == Signature) {
if ((Table != NULL) && (Table->Signature == Signature)) {
return Table;
}
}
@ -923,7 +923,7 @@ ScanTableInXSDT (
for (Index = 0; Index < EntryCount; Index ++) {
CopyMem (&EntryPtr, (VOID *)(BasePtr + Index * sizeof(UINT64)), sizeof(UINT64));
Table = (EFI_ACPI_DESCRIPTION_HEADER*)((UINTN)(EntryPtr));
if (Table->Signature == Signature) {
if ((Table != NULL) && (Table->Signature == Signature)) {
return Table;
}
}