From 98ef38ada43338c073f50a0093196f0356284625 Mon Sep 17 00:00:00 2001
From: Jean Boussier <jean.boussier@gmail.com>
Date: Wed, 27 Nov 2019 11:40:18 +0000
Subject: Freeze Regexp literals

[Feature #8948] [Feature #16377]

Since Regexp literals always reference the same instance,
allowing to mutate them can lead to state leak.
---
 re.c | 1 +
 1 file changed, 1 insertion(+)

(limited to 're.c')

diff --git a/re.c b/re.c
index 56b5144f9f..3efd540359 100644
--- a/re.c
+++ b/re.c
@@ -2967,6 +2967,7 @@ rb_reg_compile(VALUE str, int options, const char *sourcefile, int sourceline)
 	return Qnil;
     }
     FL_SET(re, REG_LITERAL);
+    rb_obj_freeze(re);
     return re;
 }
 
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