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-rw-r--r--synapse/handlers/room.py7
1 files changed, 7 insertions, 0 deletions
diff --git a/synapse/handlers/room.py b/synapse/handlers/room.py
index 99fd063084..1336a23a3a 100644
--- a/synapse/handlers/room.py
+++ b/synapse/handlers/room.py
@@ -127,6 +127,10 @@ class RoomCreationHandler(BaseHandler):
 
         self.third_party_event_rules = hs.get_third_party_event_rules()
 
+        self._invite_burst_count = (
+            hs.config.ratelimiting.rc_invites_per_room.burst_count
+        )
+
     async def upgrade_room(
         self, requester: Requester, old_room_id: str, new_version: RoomVersion
     ) -> str:
@@ -663,6 +667,9 @@ class RoomCreationHandler(BaseHandler):
             invite_3pid_list = []
             invite_list = []
 
+        if len(invite_list) + len(invite_3pid_list) > self._invite_burst_count:
+            raise SynapseError(400, "Cannot invite so many users at once")
+
         await self.event_creation_handler.assert_accepted_privacy_policy(requester)
 
         power_level_content_override = config.get("power_level_content_override")