From 831202f85c7b42ba90fa00ca23e714815d666b39 Mon Sep 17 00:00:00 2001
From: nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Sat, 17 May 2014 23:22:28 +0000
Subject: io.c: buffer must be modifiable

* io.c (io_setstrbuf): always check if the buffer is modifiable.
  [ruby-core:62643] [Bug #9847]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45979 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 io.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'io.c')

diff --git a/io.c b/io.c
index 533989cb62..5499086448 100644
--- a/io.c
+++ b/io.c
@@ -2370,8 +2370,8 @@ io_setstrbuf(VALUE *str, long len)
 	VALUE s = StringValue(*str);
 	long clen = RSTRING_LEN(s);
 	if (clen >= len) {
+	    rb_str_modify(s);
 	    if (clen != len) {
-		rb_str_modify(s);
 		rb_str_set_len(s, len);
 	    }
 	    return;
-- 
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