Merge tag 'v1.51.0rc2' into develop

Synapse 1.51.0rc2 (2022-01-24)
==============================

Bugfixes
--------

- Fix a bug introduced in Synapse 1.40.0 that caused Synapse to fail to process incoming federation traffic after handling a large amount of events in a v1 room. ([\#11806](https://github.com/matrix-org/synapse/issues/11806))

2 files changed, 5 insertions, 2 deletions

diff --git a/synapse/__init__.py b/synapse/__init__.py

index 4ef8728018..f2fd3b907f 100644
--- a/synapse/__init__.py
+++ b/synapse/__init__.py
@@ -47,7 +47,7 @@ try:
 except ImportError:
     pass
 
-__version__ = "1.51.0rc1"
+__version__ = "1.51.0rc2"
 
 if bool(os.environ.get("SYNAPSE_TEST_PATCH_LOG_CONTEXTS", False)):
     # We import here so that we don't have to install a bunch of deps when
diff --git a/synapse/storage/databases/main/event_federation.py b/synapse/storage/databases/main/event_federation.py

index 0856a9332a..ca71f073fc 100644
--- a/synapse/storage/databases/main/event_federation.py
+++ b/synapse/storage/databases/main/event_federation.py
@@ -1432,7 +1432,10 @@ class EventFederationWorkerStore(SignatureWorkerStore, EventsWorkerStore, SQLBas
 
             if room_version.event_format == EventFormatVersions.V1:
                 for prev_event_tuple in prev_events:
-                    if not isinstance(prev_event_tuple, list) or len(prev_events) != 2:
+                    if (
+                        not isinstance(prev_event_tuple, list)
+                        or len(prev_event_tuple) != 2
+                    ):
                         logger.info("Invalid prev_events for %s", event_id)
                         break