From 837f62f18a8cc801ec1f21ffe6c03173ffe15a98 Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby.or.jp>
Date: Sat, 8 Mar 2025 12:34:25 +0900
Subject: [PATCH] hash.c: should check type before setting default_proc; fix
 #6483

---
 src/hash.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/hash.c b/src/hash.c
index 1d519fe89..390e4272e 100644
--- a/src/hash.c
+++ b/src/hash.c
@@ -1477,6 +1477,7 @@ mrb_hash_set_default_proc(mrb_state *mrb, mrb_value hash)
   mrb_value ifnone = mrb_get_arg1(mrb);
 
   hash_modify(mrb, hash);
+  mrb_check_type(mrb, ifnone, MRB_TT_PROC);
   mrb_iv_set(mrb, hash, MRB_SYM(ifnone), ifnone);
   if (!mrb_nil_p(ifnone)) {
     RHASH(hash)->flags |= MRB_HASH_PROC_DEFAULT;