From: Serhiy Storchaka <storchaka@gmail.com>
Date: Fri, 30 Jan 2015 21:35:03 +0000 (+0200)
Subject: Issue #23055: Fixed off-by-one error in PyUnicode_FromFormatV.
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=5ec0bbf27dfef0d486dca1177d8c86f37969474e;p=python

Issue #23055: Fixed off-by-one error in PyUnicode_FromFormatV.
---

diff --git a/Objects/unicodeobject.c b/Objects/unicodeobject.c
index 2e5f5fd848..1e3b812528 100644
--- a/Objects/unicodeobject.c
+++ b/Objects/unicodeobject.c
@@ -893,7 +893,8 @@ PyUnicode_FromFormatV(const char *format, va_list vargs)
     }
   expand:
     if (abuffersize > 20) {
-        abuffer = PyObject_Malloc(abuffersize);
+        /* add 1 for sprintf's trailing null byte */
+        abuffer = PyObject_Malloc(abuffersize + 1);
         if (!abuffer) {
             PyErr_NoMemory();
             goto fail;