network: fix crash when Wi-Fi or eth interface gets removed from the system
When a network interface is disconnected from the system (e.g., physically removed if it's a USB adapter), probert asynchronously calls the del_link() method. Upon receiving this notification, Subiquity server wants to send an update to the Subiquity clients. The update contains information about the interface that disappeared - which is obtained through a call to netdev_info. Unfortunately, for Wi-Fi and Ethernet interfaces, netdev_info dereferences the NetworkDev.info variable. Interfaces that no longer exist on the system (and also interfaces that do not yet exist), have their "info" variable set to None - so an exception is raised when dereferencing it. Wi-Fi interface: File "subiquitycore/models/network.py", line 227, in netdev_info scan_state=self.info.wlan['scan_state'], AttributeError: 'NoneType' object has no attribute 'wlan' Ethernet interface: File "subiquitycore/models/network.py", line 201, in netdev_info is_connected = bool(self.info.is_connected) AttributeError: 'NoneType' object has no attribute 'is_connected' Fixed by making sure netdev_info does not raise if the dev.info variable is None. This is a valid use-case. Signed-off-by: Olivier Gayot <olivier.gayot@canonical.com>
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@ -205,7 +205,12 @@ class NetworkDev(object):
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def netdev_info(self) -> NetDevInfo:
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if self.type == "eth":
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is_connected = bool(self.info.is_connected)
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if self.info is not None:
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is_connected = bool(self.info.is_connected)
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else:
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# If the device has just disappeared, let's pretend it's not
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# connected.
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is_connected = False
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else:
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is_connected = True
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bond_master = None
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@ -230,10 +235,17 @@ class NetworkDev(object):
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wlan: Optional[WLANStatus] = None
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if self.type == "wlan":
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ssid, psk = self.configured_ssid
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# If the device has just disappeared, let's pretend it's not
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# scanning and has no visible SSID.
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scan_state = None
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visible_ssids: List[str] = []
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if self.info is not None:
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scan_state = self.info.wlan["scan_state"]
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visible_ssids = self.info.wlan["visible_ssids"]
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wlan = WLANStatus(
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config=WLANConfig(ssid=ssid, psk=psk),
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scan_state=self.info.wlan["scan_state"],
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visible_ssids=self.info.wlan["visible_ssids"],
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scan_state=scan_state,
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visible_ssids=visible_ssids,
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)
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dhcp_addresses = self.dhcp_addresses()
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@ -13,6 +13,8 @@
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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from unittest.mock import Mock
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from subiquitycore.models.network import NetworkDev
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from subiquitycore.tests import SubiTestCase
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@ -39,3 +41,26 @@ class TestRouteManagement(SubiTestCase):
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self.nd.remove_routes(6)
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expected = self.ipv4s
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self.assertEqual(expected, self.nd.config["routes"])
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class TestNetworkDev(SubiTestCase):
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def test_netdev_info_eth_inexistent(self):
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# LP: #2012659 - just after physically removing an Ethernet interface
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# from the system, Subiquity tries to collect information via
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# netdev_info. The code would try to dereference dev.info - but it was
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# reset to None when the interface got removed.
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# In other private reports, the same issue would occur with Wi-Fi
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# interfaces.
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model = Mock(get_all_netdevs=Mock(return_value=[]))
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nd = NetworkDev(model, "testdev0", "eth")
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info = nd.netdev_info()
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self.assertFalse(info.is_connected)
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def test_netdev_info_wlan_inexistent(self):
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# Just like test_netdev_info_eth_inexistent but with Wi-Fi interfaces
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# which suffer the same issue.
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model = Mock(get_all_netdevs=Mock(return_value=[]))
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nd = NetworkDev(model, "testdev0", "wlan")
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info = nd.netdev_info()
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self.assertIsNone(info.wlan.scan_state)
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self.assertEqual(info.wlan.visible_ssids, [])
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