$NetBSD: patch-CVE-2014-7185,v 1.1 2014/10/27 20:11:34 drochner Exp $

http://bugs.python.org/issue21831

--- Objects/bufferobject.c.orig	2014-10-27 19:46:40.000000000 +0000
+++ Objects/bufferobject.c
@@ -88,7 +88,7 @@ get_buf(PyBufferObject *self, void **ptr
             *size = count;
         else
             *size = self->b_size;
-        if (offset + *size > count)
+        if (*size > count - offset)
             *size = count - offset;
     }
     return 1;