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Add boundary check against variable MTRR count. 

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@10787 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
xli24 2010-08-10 08:57:36 +00:00
parent 13314ba32a
commit a48caeebba
1 changed files with 6 additions and 1 deletions
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7
UefiCpuPkg/Library/MtrrLib/MtrrLib.c
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@ -93,11 +93,16 @@ GetVariableMtrrCount (
VOID VOID
) )
{ {
UINT32 VariableMtrrCount;
if (!IsMtrrSupported ()) { if (!IsMtrrSupported ()) {
return 0; return 0;
} }
return (UINT32)(AsmReadMsr64 (MTRR_LIB_IA32_MTRR_CAP) & MTRR_LIB_IA32_MTRR_CAP_VCNT_MASK); VariableMtrrCount = (UINT32)(AsmReadMsr64 (MTRR_LIB_IA32_MTRR_CAP) & MTRR_LIB_IA32_MTRR_CAP_VCNT_MASK);
ASSERT (VariableMtrrCount <= MTRR_NUMBER_OF_VARIABLE_MTRR);
return VariableMtrrCount;
} }
/** /**