re PR c++/63928 (use after free in cp/constexpr.c)

	PR c++/63928
	* constexpr.c (cxx_eval_store_expression): Return init, not *valp.

From-SVN: r217790

gcc/cp/ChangeLog

+2014-11-19  Jason Merrill  <jason@redhat.com>
+
+	PR c++/63928
+	* constexpr.c (cxx_eval_store_expression): Return init, not *valp.
+
 2014-11-19  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	PR c++/55425

gcc/cp/constexpr.c

@@ -2554,7 +2554,7 @@ cxx_eval_store_expression (const constexpr_ctx *ctx, tree t,
   else if (addr)
     return target;
   else
-    return *valp;
+    return init;
 }
 
 /* Evaluate a ++ or -- expression.  */