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libnm-util: allow unknown setting types in nm_connection_get_virtual_iface_name()

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Allow calling nm_connection_get_virtual_iface_name() on a non-verified
connection by not asserting asserting against a valid base-setting.

On nma-1-0 branch, nm-applet can crash with:

    #3  0x00007ffff2993a7a in g_assertion_message_expr (domain=0x7ffff51fad86 "libnm-util", file=0x7ffff51fb728 "nm-connection.c", line=320, func=0x7ffff51fc028 "_get_type_setting", expr=<optimized out>) at gtestutils.c:2444
    #4  0x00007ffff51ac52f in _get_type_setting (connection=0xa3c160 [NMRemoteConnection]) at nm-connection.c:320
    #5  0x00007ffff51ac341 in nm_connection_get_virtual_iface_name (connection=0xa3c160 [NMRemoteConnection]) at nm-connection.c:1436
    #6  0x0000000000415bdc in add_virtual_items (type=type@entry=0x43c11d "bridge", all_devices=all_devices@entry=0x7f6580, all_connections=all_connections@entry=0x9354a0, menu=menu@entry=0x922990 [GtkMenu], applet=applet@entry=0x6cc000 [NMApplet]) at applet.c:1640
    #7  0x00000000004176f6 in nma_menu_add_devices (menu=menu@entry=0x922990 [GtkMenu], applet=applet@entry=0x6cc000 [NMApplet]) at applet.c:1713
    #8  0x0000000000418315 in nma_menu_show_cb (menu=0x922990 [GtkMenu], applet=0x6cc000 [NMApplet]) at applet.c:1974

where the connection type is "tun".

Note that libnm accepts invalid connections and exposes them to the
user (albeit issuing a warning). Later on there are many places where
that can lead to further g_return*(), which is ugly indeed.
At least, we should not assert against valid connections (because that
crashes the user) and there is a well known fact that the base setting
will be missing for tun settings. No need to even warn about that in
nm_connection_get_virtual_iface_name() (we already got the warning
during replace_settings).
This commit is contained in:
Thomas Haller 2015-12-18 13:01:23 +01:00
parent d830841d63
commit 8c27a370ff
1 changed files with 11 additions and 24 deletions
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35
libnm-util/nm-connection.c
View file

@ -300,28 +300,6 @@ nm_connection_get_setting_by_name (NMConnection *connection, const char *name)
return type ? nm_connection_get_setting (connection, type) : NULL;
}
/* not exposed until we actually need it */
static NMSetting *
_get_type_setting (NMConnection *connection)
{
NMSettingConnection *s_con;
const char *type;
NMSetting *base;
g_return_val_if_fail (NM_IS_CONNECTION (connection), NULL);
s_con = nm_connection_get_setting_connection (connection);
g_assert (s_con);
type = nm_setting_connection_get_connection_type (s_con);
g_assert (type);
base = nm_connection_get_setting_by_name (connection, type);
g_assert (base);
return base;
}
static gboolean
validate_permissions_type (GHashTable *hash, GError **error)
{
@ -1429,12 +1407,21 @@ nm_connection_get_interface_name (NMConnection *connection)
const char *
nm_connection_get_virtual_iface_name (NMConnection *connection)
{
NMSettingConnection *s_con;
const char *type;
NMSetting *base;
g_return_val_if_fail (NM_IS_CONNECTION (connection), NULL);
base = _get_type_setting (connection);
g_assert (base);
s_con = nm_connection_get_setting_connection (connection);
g_return_val_if_fail (s_con, NULL);
type = nm_setting_connection_get_connection_type (s_con);
g_return_val_if_fail (type, NULL);
base = nm_connection_get_setting_by_name (connection, type);
if (!base)
return NULL;
return nm_setting_get_virtual_iface_name (base);
}