pvs-studio: 'memcpy' function will lead to underflow of the buffer

Change-Id: I285d5ddcc8906d1e38c6b58c625dc7c894ad433a
Reviewed-on: https://gerrit.libreoffice.org/62064
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

winaccessibility/source/UAccCOM/MAccessible.cxx

@@ -2898,10 +2898,13 @@ void CMAccessible::ConvertAnyToVariant(const css::uno::Any &rAnyVal, VARIANT *pv
             break;
 
         case TypeClass_BOOLEAN:
+        {
+            bool bBoolean(false);
+            rAnyVal >>= bBoolean;
             pvData->vt = VT_BOOL;
-            memcpy(&pvData->boolVal, rAnyVal.getValue(), sizeof(sal_Bool));
+            pvData->boolVal = bBoolean; // boolVal is a VARIANT_BOOL, a 16bit field
             break;
-
+        }
         case TypeClass_BYTE:
             pvData->vt = VT_UI1;
             memcpy(&pvData->bVal, rAnyVal.getValue(), sizeof(sal_Int8));