From: Hugh McMaster <hugh.mcmaster@outlook.com>
Subject: [PATCH] libs/wine/string.c: Prevent a segmentation fault
Message-Id: <BLU171-W92DD5DB2B83A95C35683BFF26D0@phx.gbl>
Date: Wed, 17 Dec 2014 21:41:28 +1100

Prevent a segmentation fault when calling vsnprintfW(NULL, <non-zero number>, fmt, va_args).
 		 	   		  

From 8b080dc55c918ab47b1cc067696ac019b69174c0 Mon Sep 17 00:00:00 2001
From: Hugh McMaster <hugh.mcmaster@outlook.com>
Date: Wed, 17 Dec 2014 20:59:58 +1100
Subject: [PATCH] libs/wine/string.c: Prevent segmentation fault

---
 libs/wine/string.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libs/wine/string.c b/libs/wine/string.c
index f2a9bd3..45a8810 100644
--- a/libs/wine/string.c
+++ b/libs/wine/string.c
@@ -360,6 +360,9 @@ int vsnprintfW(WCHAR *str, size_t len, const WCHAR *format, va_list valist)
     const WCHAR *iter = format;
     char bufa[512], fmtbufa[64], *fmta;
 
+    if (!str && len)
+        return -1;
+
     while (*iter)
     {
         while (*iter && *iter != '%')
-- 
1.9.1