io.c: pipe_register_fptr

* io.c (pipe_register_fptr): get rid of double registration which
  causes access after free and segfault.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62121 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 9 insertions, 0 deletions

diff --git a/test/ruby/test_process.rb b/test/ruby/test_process.rb
index 57bfd78f7c..5d85ca3a18 100644
--- a/test/ruby/test_process.rb
+++ b/test/ruby/test_process.rb
@@ -1810,6 +1810,15 @@ class TestProcess < Test::Unit::TestCase
     end
   end
 
+  def test_popen_reopen
+    assert_separately([], "#{<<~"begin;"}\n#{<<~'end;'}")
+    begin;
+      io = File.open(IO::NULL)
+      IO.popen("echo") {|f| io.reopen(f)}
+      io.reopen(io.dup)
+    end;
+  end
+
   def test_execopts_new_pgroup
     return unless windows?