From 2e7e153a2af1456515d43b6381e38534b069b1c2 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Mon, 19 Dec 2022 14:10:58 +0900
Subject: [Bug #19242] Prohibit circular causes to be loaded

---
 eval_error.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

(limited to 'eval_error.c')

diff --git a/eval_error.c b/eval_error.c
index e02f54e8e6..948a205dd9 100644
--- a/eval_error.c
+++ b/eval_error.c
@@ -290,6 +290,17 @@ show_cause(VALUE errinfo, VALUE str, VALUE opt, VALUE highlight, VALUE reverse,
     }
 }
 
+void
+rb_exc_check_circular_cause(VALUE exc)
+{
+    VALUE cause = exc, shown_causes = 0;
+    do {
+        if (shown_cause_p(cause, &shown_causes)) {
+            rb_raise(rb_eArgError, "circular causes");
+        }
+    } while (!NIL_P(cause = rb_attr_get(cause, id_cause)));
+}
+
 void
 rb_error_write(VALUE errinfo, VALUE emesg, VALUE errat, VALUE str, VALUE opt, VALUE highlight, VALUE reverse)
 {
-- 
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