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libnm-glib: fix a crash in nm_client_new() (rh #1010288)

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We have to check if 'client' is valid when calling _nm_object_ensure_inited().
Creation of NMClient object can fail, because its parent NMObject's
constructor() returns NULL for D-Bus errors.

https://bugzilla.redhat.com/show_bug.cgi?id=1010288
This commit is contained in:
Jiří Klimeš
2013-10-11 11:14:05 +02:00
parent 8a046bedbb
commit 570b9b362d
1 changed files with 30 additions and 5 deletions
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35
libnm-glib/nm-client.c
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@@ -18,7 +18,7 @@
* Boston, MA 02110-1301 USA.
*
* Copyright (C) 2007 - 2008 Novell, Inc.
* Copyright (C) 2007 - 2012 Red Hat, Inc.
* Copyright (C) 2007 - 2013 Red Hat, Inc.
*/
#include <dbus/dbus-glib.h>
@@ -1616,7 +1616,7 @@ nm_client_check_connectivity_finish (NMClient *client,
* control them. To access and modify network configuration data, use the
* #NMRemoteSettings object.
*
* Returns: a new #NMClient
* Returns: a new #NMClient or NULL on an error
**/
NMClient *
nm_client_new (void)
@@ -1624,7 +1624,13 @@ nm_client_new (void)
NMClient *client;
client = g_object_new (NM_TYPE_CLIENT, NM_OBJECT_DBUS_PATH, NM_DBUS_PATH, NULL);
_nm_object_ensure_inited (NM_OBJECT (client));
/* NMObject's constructor() can fail on a D-Bus connection error. So we can
* get NULL here instead of a valid NMClient object.
*/
if (client)
_nm_object_ensure_inited (NM_OBJECT (client));
return client;
}
@@ -1650,7 +1656,8 @@ client_inited (GObject *source, GAsyncResult *result, gpointer user_data)
*
* Creates a new #NMClient and begins asynchronously initializing it.
* @callback will be called when it is done; use
* nm_client_new_finish() to get the result.
* nm_client_new_finish() to get the result. Note that on an error,
* the callback can be invoked with two first parameters as NULL.
*
* NOTE: #NMClient provides information about devices and a mechanism to
* control them. To access and modify network configuration data, use the
@@ -1664,8 +1671,16 @@ nm_client_new_async (GCancellable *cancellable,
NMClient *client;
GSimpleAsyncResult *simple;
simple = g_simple_async_result_new (NULL, callback, user_data, nm_client_new_async);
client = g_object_new (NM_TYPE_CLIENT, NM_OBJECT_DBUS_PATH, NM_DBUS_PATH, NULL);
/* When client is NULL, do no continue with initialization and run callback
* directly with result == NULL indicating NMClient creation failure.
*/
if (!client) {
callback (NULL, NULL, user_data);
return;
}
simple = g_simple_async_result_new (NULL, callback, user_data, nm_client_new_async);
g_async_initable_init_async (G_ASYNC_INITABLE (client), G_PRIORITY_DEFAULT,
cancellable, client_inited, simple);
}
@@ -1684,6 +1699,16 @@ nm_client_new_finish (GAsyncResult *result, GError **error)
{
GSimpleAsyncResult *simple;
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
if (!result) {
g_set_error_literal (error,
NM_CLIENT_ERROR,
NM_CLIENT_ERROR_UNKNOWN,
"NMClient initialization failed (or you passed NULL 'result' by mistake)");
return NULL;
}
g_return_val_if_fail (g_simple_async_result_is_valid (result, NULL, nm_client_new_async), NULL);
simple = G_SIMPLE_ASYNC_RESULT (result);