https://git.ruby-lang.org/ruby.git/commit/?id=2ecfb88ee5

From 2ecfb88ee50510955acd3ae9fc94a5f109e7f109 Mon Sep 17 00:00:00 2001
From: Jeremy Evans <code@j...>
Date: Thu, 28 May 2020 19:49:10 -0700
Subject: Correctly remove temporary directory if path yielded is mutated

Another approach would be to freeze the string, but that could
cause backwards compatibility issues.

Fixes [Bug #16918]

diff --git a/lib/tmpdir.rb b/lib/tmpdir.rb
index c613655..e6cb327 100644
--- a/lib/tmpdir.rb
+++ b/lib/tmpdir.rb
@@ -86,7 +86,7 @@ class Dir https://github.com/ruby/ruby/blob/trunk/lib/tmpdir.rb#L86
     }
     if block_given?
       begin
-        yield path
+        yield path.dup
       ensure
         unless base
           stat = File.stat(File.dirname(path))
diff --git a/test/test_tmpdir.rb b/test/test_tmpdir.rb
index c599dcf..50583b5 100644
--- a/test/test_tmpdir.rb
+++ b/test/test_tmpdir.rb
@@ -52,6 +52,17 @@ class TestTmpdir < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/test_tmpdir.rb#L52
     }
   end
 
+  def test_mktmpdir_mutate
+    bug16918 = '[ruby-core:98563]'
+    assert_nothing_raised(bug16918) do
+      assert_mktmpdir_traversal do |traversal_path|
+        Dir.mktmpdir(traversal_path + 'foo') do |actual|
+          actual << "foo"
+        end
+      end
+    end
+  end
+
   def test_mktmpdir_traversal
     assert_mktmpdir_traversal do |traversal_path|
       Dir.mktmpdir(traversal_path + 'foo') do |actual|
-- 
cgit v0.10.2


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