From cbc18f328c7b87cf57763da3c660897cc0c7886c Mon Sep 17 00:00:00 2001
From: Victor Stinner <victor.stinner@gmail.com>
Date: Fri, 5 Dec 2014 22:51:51 +0100
Subject: Issue #9647: os.confstr() ensures that the second call to confstr()
 returns the same length.

---
 Modules/posixmodule.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Modules/posixmodule.c b/Modules/posixmodule.c
index eb0a68d..bd7cd8a 100644
--- a/Modules/posixmodule.c
+++ b/Modules/posixmodule.c
@@ -14369,10 +14369,12 @@ os_confstr_impl(PyModuleDef *module, int name)
     }
 
     if (len >= sizeof(buffer)) {
+        size_t len2;
         char *buf = PyMem_Malloc(len);
         if (buf == NULL)
             return PyErr_NoMemory();
-        confstr(name, buf, len);
+        len2 = confstr(name, buf, len);
+        assert(len == len2);
         result = PyUnicode_DecodeFSDefaultAndSize(buf, len-1);
         PyMem_Free(buf);
     }
-- 
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