From de6032c2be1f77f7d4f54b107558be86496cf90d Mon Sep 17 00:00:00 2001
From: Loic Jaquemet <loic.jaquemet+github@gmail.com>
Date: Mon, 25 Jan 2016 08:43:00 -0700
Subject: [PATCH] fix pointertypes heuritics

---
 haystack/allocators/heapwalker.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/haystack/allocators/heapwalker.py b/haystack/allocators/heapwalker.py
index 818d6f0a..66357907 100644
--- a/haystack/allocators/heapwalker.py
+++ b/haystack/allocators/heapwalker.py
@@ -80,6 +80,9 @@ def get_heap_walker(self, mapping):
             raise TypeError('Feed me a IMemoryMapping object')
         if not self._heap_walkers_dict:
             self.list_heap_walkers()
+        # BUG FIXME reverse
+        if mapping.start not in self._heap_walkers_dict:
+            raise ValueError('mapping not used as a heap')
         walker = self._heap_walkers_dict[mapping.start]
         return walker