From df23e30bea2741087440c186e645e6ae4c218651 Mon Sep 17 00:00:00 2001
From: Victor Stinner <victor.stinner@gmail.com>
Date: Thu, 7 Nov 2013 13:33:36 +0100
Subject: [PATCH] Fix _Py_normalize_encoding(): ensure that buffer is big
 enough to store "utf-8" if the input string is NULL

---
 Objects/unicodeobject.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Objects/unicodeobject.c b/Objects/unicodeobject.c
index 4ae73771f23..1375ef3093d 100644
--- a/Objects/unicodeobject.c
+++ b/Objects/unicodeobject.c
@@ -2983,6 +2983,8 @@ _Py_normalize_encoding(const char *encoding,
     char *l_end;
 
     if (encoding == NULL) {
+        if (lower_len < 6)
+            return 0;
         strcpy(lower, "utf-8");
         return 1;
     }