bpo-30594: Fixed refcounting in newPySSLSocket (python#1992)

njsmith · serhiy-storchaka · commit 65ece7ca2366 · 2017-06-08T09:30:43.000+03:00
If pass a server_hostname= that fails IDNA decoding to SSLContext.wrap_socket or SSLContext.wrap_bio, then the SSLContext object had a spurious Py_DECREF called on it, eventually leading to segfaults.
diff --git a/Modules/_ssl.c b/Modules/_ssl.c
@@ -596,6 +596,7 @@ newPySSLSocket(PySSLContext *sslctx, PySocketSockObject *sock,
     self->ssl = NULL;
     self->Socket = NULL;
     self->ctx = sslctx;
+    Py_INCREF(sslctx);
     self->shutdown_seen_zero = 0;
     self->owner = NULL;
     self->server_hostname = NULL;
@@ -609,8 +610,6 @@ newPySSLSocket(PySSLContext *sslctx, PySocketSockObject *sock,
         self->server_hostname = hostname;
     }
 
-    Py_INCREF(sslctx);
-
     /* Make sure the SSL error state is initialized */
     (void) ERR_get_state();
     ERR_clear_error();
