Update vf_common.cpp

Author: chrchr-github

lib/vf_common.cpp

@@ -160,11 +160,13 @@ namespace ValueFlow
                 value.setKnown();
             setTokenValue(tok, std::move(value), settings);
         } else if (Token::simpleMatch(tok, "sizeof (")) {
-            if (tok->next()->astOperand2() && !tok->next()->astOperand2()->isLiteral() && tok->next()->astOperand2()->valueType() &&
-                (tok->next()->astOperand2()->valueType()->pointer == 0 || // <- TODO this is a bailout, abort when there are array->pointer conversions
-                 (tok->next()->astOperand2()->variable() && !tok->next()->astOperand2()->variable()->isArray())) &&
-                !tok->next()->astOperand2()->valueType()->isEnum()) { // <- TODO this is a bailout, handle enum with non-int types
-                const size_t sz = tok->next()->astOperand2()->valueType()->getSizeOf(settings, ValueType::Accuracy::ExactOrZero, ValueType::SizeOf::Pointer);
+            const Token* const obj = tok->next()->astOperand2();
+            if (obj && !obj->isLiteral() && obj->valueType() &&
+                (obj->valueType()->pointer == 0 || // <- TODO this is a bailout, abort when there are array->pointer conversions
+                 (obj->variable() && !obj->variable()->isArray())) &&
+                !obj->valueType()->isEnum()) { // <- TODO this is a bailout, handle enum with non-int types
+                const auto ptrPointee = obj->valueType()->pointer > 0 ? ValueType::SizeOf::Pointer : ValueType::SizeOf::Pointee;
+                const size_t sz = obj->valueType()->getSizeOf(settings, ValueType::Accuracy::ExactOrZero, ptrPointee);
                 if (sz) {
                     Value value(sz);
                     value.setKnown();