From be9e203563b761f271abc58e1854f027ad808641 Mon Sep 17 00:00:00 2001
From: TOMITA Masahiro <tommy@tmtm.org>
Date: Mon, 15 Dec 2014 20:24:01 +0900
Subject: FIX: IO#sysread occurs SEGV

---
 src/io.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/io.c b/src/io.c
index d7e1b0fba..e80483145 100644
--- a/src/io.c
+++ b/src/io.c
@@ -420,7 +420,7 @@ mrb_io_sysread(mrb_state *mrb, mrb_value io)
   }
 
   if (mrb_nil_p(buf)) {
-    buf = mrb_str_new(mrb, "", maxlen);
+    buf = mrb_str_new(mrb, NULL, maxlen);
   }
   if (RSTRING_LEN(buf) != maxlen) {
     buf = mrb_str_resize(mrb, buf, maxlen);
-- 
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