From 0cec0f461567c152dd222982d3223dbd5e3423e7 Mon Sep 17 00:00:00 2001
From: Gisle Vanem <gisle.vanem@gmail.com>
Date: Thu, 6 Jul 2017 23:14:29 +0200
Subject: [PATCH] memdebug: don't setbuf() if the file open failed

Bug: https://github.com/curl/curl/issues/828#issuecomment-313475151
---
 lib/memdebug.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/memdebug.c b/lib/memdebug.c
index 2b8808ab0..16434f819 100644
--- a/lib/memdebug.c
+++ b/lib/memdebug.c
@@ -115,7 +115,8 @@ void curl_memdebug(const char *logname)
       logfile = stderr;
 #ifdef MEMDEBUG_LOG_SYNC
     /* Flush the log file after every line so the log isn't lost in a crash */
-    setbuf(logfile, (char *)NULL);
+    if(logfile)
+      setbuf(logfile, (char *)NULL);
 #endif
   }
 }