Protect cypclass dereferencing with overloaded operators

Cython/Compiler/ExprNodes.py

@@ -11463,7 +11463,7 @@ class NumBinopNode(BinopNode):
             else:
                 result1, result2 = self.operand1.result(), self.operand2.result()
             if self.operand1.type.is_cyp_class:
-                result1 = '*' + result1
+                result1 = "(*%s)" % result1
             return "(%s %s %s)" % (result1, self.operator, result2)
         else:
             func = self.type.binary_op(self.operator)
@@ -11890,7 +11890,7 @@ class ModNode(DivNode):
             else:
                 op1 = self.operand1.result()
                 if self.operand1.type.is_cyp_class:
-                    op1 = '*' + op1
+                    op1 = "(*%s)" % op1
                 return "(%s %% %s)" % (
                     op1,
                     self.operand2.result())
@@ -11961,7 +11961,7 @@ class PowNode(NumBinopNode):
                 return self.type.cast_code(operand.result())
         op1 = typecast(self.operand1)
         if self.operand1.type.is_cyp_class:
-            op1 = '*' + op1
+            op1 = "(*%s)" % op1
         return "%s(%s, %s)" % (
             self.pow_func,
             op1,
@@ -12921,7 +12921,7 @@ class PrimaryCmpNode(ExprNode, CmpNode):
             else:
                 result1, result2 = operand1.result(), operand2.result()
                 if operand1.type.is_cyp_class and self.operator not in ("is", "is_not"):
-                    result1 = '*' + result1
+                    result1 = "(*%s)" % result1
                 if self.is_memslice_nonecheck:
                     if operand1.type.is_memoryviewslice:
                         result1 = "((PyObject *) %s.memview)" % result1

Cython/Compiler/Nodes.py

@@ -6127,7 +6127,7 @@ class InPlaceAssignmentNode(AssignmentNode):
             # TODO: make sure overload is declared
             l_op = lhs.result()
             if lhs.type.is_cyp_class:
-                l_op = '*' + l_op
+                l_op = "(*%s)" % l_op
             code.putln("%s %s= %s;" % (l_op, c_op, rhs.result()))
         lhs.generate_subexpr_disposal_code(code)
         lhs.free_subexpr_temps(code)