From a049443fab2442fff090470f8a4ec7a7c79c83ff Mon Sep 17 00:00:00 2001
From: Victor Stinner <victor.stinner@gmail.com>
Date: Wed, 3 Oct 2012 23:03:46 +0200
Subject: PyUnicode_Format(): disable overallocation when we are writing the
 last part of the output string

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

diff --git a/Objects/unicodeobject.c b/Objects/unicodeobject.c
index 09067e9..53f0fb5 100644
--- a/Objects/unicodeobject.c
+++ b/Objects/unicodeobject.c
@@ -13583,8 +13583,10 @@ PyUnicode_Format(PyObject *format, PyObject *args)
                 fmtpos++;
                 fmtcnt--;
             }
-            if (fmtcnt < 0)
+            if (fmtcnt < 0) {
                 fmtpos--;
+                writer.overallocate = 0;
+            }
             sublen = fmtpos - nonfmtpos;
             maxchar = _PyUnicode_FindMaxChar(uformat,
                                              nonfmtpos, nonfmtpos + sublen);
-- 
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