From e1ff71029f95e3274136263adbdc51c662ec52de Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby-lang.org>
Date: Wed, 11 Jan 2017 17:51:11 +0900
Subject: String#replace should check replacing string; fix #3374

This issue was reported by https://hackerone.com/tunz
---
 src/string.c | 1 +
 1 file changed, 1 insertion(+)

(limited to 'src')

diff --git a/src/string.c b/src/string.c
index b4746545a..d6bdd6975 100644
--- a/src/string.c
+++ b/src/string.c
@@ -519,6 +519,7 @@ str_replace(mrb_state *mrb, struct RString *s1, struct RString *s2)
   long len;
 
   check_frozen(mrb, s1);
+  if (s1 == s2) return mrb_obj_value(s1);
   len = RSTR_LEN(s2);
   if (RSTR_SHARED_P(s1)) {
     str_decref(mrb, s1->as.heap.aux.shared);
-- 
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