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UefiCpuPkg/PiSmmCpuDxeSmm: Avoid possible NULL ptr dereference 

Within function GetUefiMemoryAttributesTable(), add a check to avoid
possible null pointer dereference.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Hao Wu <hao.a.wu@intel.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>
This commit is contained in:
Hao Wu 2018-07-30 13:20:13 +08:00
parent 264914a512
commit 6d9a0a9420
1 changed files with 1 additions and 1 deletions
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UefiCpuPkg/PiSmmCpuDxeSmm/SmmCpuMemoryManagement.c
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@ -1098,7 +1098,7 @@ GetUefiMemoryAttributesTable (
UINTN MemoryAttributesTableSize; UINTN MemoryAttributesTableSize;
Status = EfiGetSystemConfigurationTable (&gEfiMemoryAttributesTableGuid, (VOID **)&MemoryAttributesTable); Status = EfiGetSystemConfigurationTable (&gEfiMemoryAttributesTableGuid, (VOID **)&MemoryAttributesTable);
if (!EFI_ERROR (Status)) { if (!EFI_ERROR (Status) && (MemoryAttributesTable != NULL)) {
MemoryAttributesTableSize = sizeof(EFI_MEMORY_ATTRIBUTES_TABLE) + MemoryAttributesTable->DescriptorSize * MemoryAttributesTable->NumberOfEntries; MemoryAttributesTableSize = sizeof(EFI_MEMORY_ATTRIBUTES_TABLE) + MemoryAttributesTable->DescriptorSize * MemoryAttributesTable->NumberOfEntries;
mUefiMemoryAttributesTable = AllocateCopyPool (MemoryAttributesTableSize, MemoryAttributesTable); mUefiMemoryAttributesTable = AllocateCopyPool (MemoryAttributesTableSize, MemoryAttributesTable);
ASSERT (mUefiMemoryAttributesTable != NULL); ASSERT (mUefiMemoryAttributesTable != NULL);