fix a memory leak in AIA parsing (#4836)

* fix a memory leak in AIA parsing

* oops can't remove that

1 files changed, 20 insertions, 1 deletions

diff --git a/tests/hazmat/backends/test_openssl_memleak.py b/tests/hazmat/backends/test_openssl_memleak.py
index ed22b5db..f9ae1c46 100644
--- a/tests/hazmat/backends/test_openssl_memleak.py
+++ b/tests/hazmat/backends/test_openssl_memleak.py
@@ -210,7 +210,7 @@ class TestOpenSSLMemoryLeaks(object):
     @pytest.mark.parametrize("path", [
         "x509/PKITS_data/certs/ValidcRLIssuerTest28EE.crt",
     ])
-    def test_x509_certificate_extensions(self, path):
+    def test_der_x509_certificate_extensions(self, path):
         assert_no_memory_leaks(textwrap.dedent("""
         def func(path):
             from cryptography import x509
@@ -226,6 +226,25 @@ class TestOpenSSLMemoryLeaks(object):
             cert.extensions
         """), [path])
 
+    @pytest.mark.parametrize("path", [
+        "x509/cryptography.io.pem",
+    ])
+    def test_pem_x509_certificate_extensions(self, path):
+        assert_no_memory_leaks(textwrap.dedent("""
+        def func(path):
+            from cryptography import x509
+            from cryptography.hazmat.backends.openssl import backend
+
+            import cryptography_vectors
+
+            with cryptography_vectors.open_vector_file(path, "rb") as f:
+                cert = x509.load_pem_x509_certificate(
+                    f.read(), backend
+                )
+
+            cert.extensions
+        """), [path])
+
     def test_x509_csr_extensions(self):
         assert_no_memory_leaks(textwrap.dedent("""
         def func():