From: Victor Stinner <victor.stinner@gmail.com>
Date: Fri, 5 Dec 2014 21:51:51 +0000 (+0100)
Subject: Issue #9647: os.confstr() ensures that the second call to confstr() returns the
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=cbc18f328c7b87cf57763da3c660897cc0c7886c;p=python

Issue #9647: os.confstr() ensures that the second call to confstr() returns the
same length.
---

diff --git a/Modules/posixmodule.c b/Modules/posixmodule.c
index eb0a68d947..bd7cd8ad48 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);
     }