From: Gregory P. Smith <greg@mad-scientist.com>
Date: Mon, 26 May 2008 22:07:28 +0000 (+0000)
Subject: Fix issue2588: Do not execute str[size-1] = '\0' when a 0 size is
X-Git-Tag: v2.6b1~224
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=933d3731deab19b2565fbb0d07511e67277d3d58;p=python

Fix issue2588: Do not execute str[size-1] = '\0' when a 0 size is
passed in.  (The assert won't prevent this in non-debug builds).
---

diff --git a/Python/mysnprintf.c b/Python/mysnprintf.c
index 8c47794642..3173863c46 100644
--- a/Python/mysnprintf.c
+++ b/Python/mysnprintf.c
@@ -98,7 +98,8 @@ PyOS_vsnprintf(char *str, size_t size, const char  *format, va_list va)
 	PyMem_FREE(buffer);
 #endif
 Done:
-	str[size-1] = '\0';
+	if (size > 0)
+		str[size-1] = '\0';
 	return len;
 #undef _PyOS_vsnprintf_EXTRA_SPACE
 }