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-rw-r--r--synapse/handlers/sso.py9
1 files changed, 9 insertions, 0 deletions
diff --git a/synapse/handlers/sso.py b/synapse/handlers/sso.py
index 749d7e93b0..e1c0bff1b2 100644
--- a/synapse/handlers/sso.py
+++ b/synapse/handlers/sso.py
@@ -37,6 +37,7 @@ from twisted.web.server import Request
 from synapse.api.constants import LoginType
 from synapse.api.errors import Codes, NotFoundError, RedirectException, SynapseError
 from synapse.config.sso import SsoAttributeRequirement
+from synapse.handlers.device import DeviceHandler
 from synapse.handlers.register import init_counters_for_auth_provider
 from synapse.handlers.ui_auth import UIAuthSessionDataConstants
 from synapse.http import get_request_user_agent
@@ -1035,6 +1036,8 @@ class SsoHandler:
     ) -> None:
         """Revoke any devices and in-flight logins tied to a provider session.
 
+        Can only be called from the main process.
+
         Args:
             auth_provider_id: A unique identifier for this SSO provider, e.g.
                 "oidc" or "saml".
@@ -1042,6 +1045,12 @@ class SsoHandler:
             expected_user_id: The user we're expecting to logout. If set, it will ignore
                 sessions belonging to other users and log an error.
         """
+
+        # It is expected that this is the main process.
+        assert isinstance(
+            self._device_handler, DeviceHandler
+        ), "revoking SSO sessions can only be called on the main process"
+
         # Invalidate any running user-mapping sessions
         to_delete = []
         for session_id, session in self._username_mapping_sessions.items():