From b7c5af7e64b3e4fa631ef14fcf5165891c8e1351 Mon Sep 17 00:00:00 2001
From: Matt Pharr <matt.pharr@intel.com>
Date: Mon, 6 Feb 2012 13:59:02 -0800
Subject: [PATCH] Prohibit returning functions from functions.

(Fix malformed program crasher)
---
 decl.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/decl.cpp b/decl.cpp
index ec8022b7..beff32d8 100644
--- a/decl.cpp
+++ b/decl.cpp
@@ -447,6 +447,10 @@ Declarator::GetType(const Type *base, DeclSpecs *ds) const {
             Error(pos, "No return type provided in function declaration.");
             return NULL;
         }
+        if (dynamic_cast<const FunctionType *>(returnType) != NULL) {
+            Error(pos, "Illegal to return function type from function.");
+            return NULL;
+        }
         
         bool isExported = ds && (ds->storageClass == SC_EXPORT);
         bool isExternC =  ds && (ds->storageClass == SC_EXTERN_C);