https://git.ruby-lang.org/ruby.git/commit/?id=5190926e40

From 5190926e40febeeb3822b8bd7c031b06279dc3f1 Mon Sep 17 00:00:00 2001
From: Samuel Williams <samuel.williams@o...>
Date: Mon, 15 Nov 2021 15:28:02 +1300
Subject: Validate string type when constructing IO::Buffer for string mapping.

---
 io_buffer.c                 | 2 ++
 test/ruby/test_io_buffer.rb | 8 ++++++++
 2 files changed, 10 insertions(+)

diff --git a/io_buffer.c b/io_buffer.c
index 45dbfd02da3..bd902ed8d44 100644
--- a/io_buffer.c
+++ b/io_buffer.c
@@ -259,6 +259,8 @@ rb_io_buffer_type_allocate(VALUE self) https://github.com/ruby/ruby/blob/trunk/io_buffer.c#L259
 VALUE
 rb_io_buffer_type_for(VALUE klass, VALUE string)
 {
+    StringValue(string);
+
     VALUE instance = rb_io_buffer_type_allocate(klass);
 
     struct rb_io_buffer *data = NULL;
diff --git a/test/ruby/test_io_buffer.rb b/test/ruby/test_io_buffer.rb
index 12937729f4e..57d1867b25c 100644
--- a/test/ruby/test_io_buffer.rb
+++ b/test/ruby/test_io_buffer.rb
@@ -81,6 +81,14 @@ class TestIOBuffer < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/ruby/test_io_buffer.rb#L81
     assert_equal "Hello World", string
   end
 
+  def test_non_string
+    not_string = Object.new
+
+    assert_raise TypeError do
+      IO::Buffer.for(not_string)
+    end
+  end
+
   def test_resize
     buffer = IO::Buffer.new(1024, IO::Buffer::MAPPED)
     buffer.resize(2048, 0)
-- 
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