From 15d3b7fe6dd421cc4ff77d106d17b0e9fd1ead45 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Sat, 1 Oct 2022 16:14:59 +0900
Subject: Fix an out of bound access

---
 struct.c | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'struct.c')

diff --git a/struct.c b/struct.c
index a025d21af6..3a5dc8b7d4 100644
--- a/struct.c
+++ b/struct.c
@@ -1793,6 +1793,12 @@ rb_data_initialize_m(int argc, const VALUE *argv, VALUE self)
     VALUE members = struct_ivar_get(klass, id_members);
     size_t num_members = RARRAY_LEN(members);
 
+    if (argc == 0) {
+        if (num_members > 0) {
+            rb_exc_raise(rb_keyword_error_new("missing", members));
+        }
+        return Qnil;
+    }
     if (argc > 1 || !RB_TYPE_P(argv[0], T_HASH)) {
         rb_raise(rb_eArgError, "wrong number of arguments (given %d, expected 0)", argc);
     }
-- 
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