From 79e3d6bb9e007fc97153c1097daf78e9a201a642 Mon Sep 17 00:00:00 2001
From: "Urabe, Shyouhei" <shyouhei@ruby-lang.org>
Date: Wed, 19 Sep 2018 16:46:44 +0900
Subject: fix shortcut condition

rb_reg_match expects its first argument to be a Regexp instance.
Should check that.
---
 vm_insnhelper.c | 1 +
 1 file changed, 1 insertion(+)

(limited to 'vm_insnhelper.c')

diff --git a/vm_insnhelper.c b/vm_insnhelper.c
index 6a198f94e4..1c74b121e8 100644
--- a/vm_insnhelper.c
+++ b/vm_insnhelper.c
@@ -4358,6 +4358,7 @@ static VALUE
 vm_opt_regexpmatch2(VALUE recv, VALUE obj)
 {
     if (CLASS_OF(recv) == rb_cString &&
+        CLASS_OF(obj) == rb_cRegexp &&
 	BASIC_OP_UNREDEFINED_P(BOP_MATCH, STRING_REDEFINED_OP_FLAG)) {
 	return rb_reg_match(obj, recv);
     }
-- 
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