Issue #13458: Fix a memory leak in the ssl module when decoding a certificate...

Issue #13458: Fix a memory leak in the ssl module when decoding a certificate with a subjectAltName.
Patch by Robert Xiao.

Misc/NEWS

@@ -79,6 +79,9 @@ Core and Builtins
 Library
 -------
 
+- Issue #13458: Fix a memory leak in the ssl module when decoding a
+  certificate with a subjectAltName.  Patch by Robert Xiao.
+
 - Issue #13415: os.unsetenv() doesn't ignore errors anymore.
 
 - Issue #13322: Fix BufferedWriter.write() to ensure that BlockingIOError is

Modules/_ssl.c

@@ -798,6 +798,7 @@ _get_peer_alt_names (X509 *certificate) {
             }
             Py_DECREF(t);
         }
+        sk_GENERAL_NAME_pop_free(names, GENERAL_NAME_free);
     }
     BIO_free(biobuf);
     if (peer_alt_names != Py_None) {