Fix type casting issue when calculating pointers offset

Cc: Wu Hao <hao.a...@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Chao Zhang <chao.b.zh...@intel.com>
---
 SecurityPkg/Tcg/Tcg2Smm/Tcg2Smm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/SecurityPkg/Tcg/Tcg2Smm/Tcg2Smm.c 
b/SecurityPkg/Tcg/Tcg2Smm/Tcg2Smm.c
index 6eb62ae..c3cee83 100644
--- a/SecurityPkg/Tcg/Tcg2Smm/Tcg2Smm.c
+++ b/SecurityPkg/Tcg/Tcg2Smm/Tcg2Smm.c
@@ -543,7 +543,7 @@ UpdatePossibleResource (
   //
   DataPtr += 2;
   if (DataPtr < DataEndPtr) {
-    SetMem(DataPtr, (UINTN)(DataEndPtr - DataPtr), AML_NOOP_OP);
+    SetMem(DataPtr, (UINTN)DataEndPtr - (UINTN)DataPtr, AML_NOOP_OP);
   }
 
   return EFI_SUCCESS;
-- 
1.9.5.msysgit.1

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