From 9865ee2c46b7cc9244c3d78b786ee14a7a302e53 Mon Sep 17 00:00:00 2001
From: tarui <tarui@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Tue, 7 Dec 2010 13:38:36 +0000
Subject: 	* io.c (io_read): duplicate string if shared. [ruby-dev:42719]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@30122 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 io.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

(limited to 'io.c')

diff --git a/io.c b/io.c
index 26af3ce6ef..d5d1220294 100644
--- a/io.c
+++ b/io.c
@@ -2212,7 +2212,10 @@ io_read(int argc, VALUE *argv, VALUE io)
     rb_scan_args(argc, argv, "02", &length, &str);
 
     if (NIL_P(length)) {
-	if (!NIL_P(str)) StringValue(str);
+	if (!NIL_P(str)){
+	    StringValue(str);
+	    rb_str_modify(str);
+	}
 	GetOpenFile(io, fptr);
 	rb_io_check_char_readable(fptr);
 	return read_all(fptr, remain_size(fptr), str);
-- 
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