zlib.c: memory leak in gunzip

* ext/zlib/zlib.c (zlib_gunzip): clear zstream to fix memory leak.
  [ruby-core:83162] [Bug #13982]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@60130 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 8 insertions, 0 deletions

diff --git a/test/zlib/test_zlib.rb b/test/zlib/test_zlib.rb
index d53717ef74..2d539dda1a 100644
--- a/test/zlib/test_zlib.rb
+++ b/test/zlib/test_zlib.rb
@@ -1196,5 +1196,13 @@ if defined? Zlib
       src = %w[1f8b080000000000000].pack("H*")
       assert_raise(Zlib::GzipFile::Error){ Zlib.gunzip(src) }
     end
+
+    def test_gunzip_no_memory_leak
+      assert_no_memory_leak(%[-rzlib], "#{<<~"{#"}", "#{<<~'};'}")
+      d = Zlib.gzip("data")
+      {#
+        10_000.times {Zlib.gunzip(d)}
+      };
+    end
   end
 end