Fix null pointer access in Ripper#initialize

In `rb_ruby_ripper_parser_allocate`, `r->p` is NULL between creating
`self` and `parser_params` assignment.  As GC can happen there, the
typed-data functions for it need to consider the case.

1 files changed, 7 insertions, 0 deletions

diff --git a/test/ripper/test_ripper.rb b/test/ripper/test_ripper.rb
index c6775c5c93..2bb307eddf 100644
--- a/test/ripper/test_ripper.rb
+++ b/test/ripper/test_ripper.rb
@@ -14,6 +14,13 @@ class TestRipper::Ripper < Test::Unit::TestCase
     @ripper = Ripper.new '1 + 1'
   end
 
+  def test_new
+    assert_separately(%w[-rripper], "#{<<~"begin;"}\n#{<<~'end;'}")
+    begin;
+      assert_nil EnvUtil.under_gc_stress {Ripper.new("")}.state
+    end;
+  end
+
   def test_column
     assert_nil @ripper.column
   end