1 files changed, 13 insertions, 0 deletions
diff --git a/synapse/handlers/presence.py b/synapse/handlers/presence.py
index da9f0da69e..16dbddee03 100644
--- a/synapse/handlers/presence.py
+++ b/synapse/handlers/presence.py
@@ -265,6 +265,12 @@ class PresenceHandler(object):
             to_notify = {}  # Changes we want to notify everyone about
             to_federation_ping = {}  # These need sending keep-alives
 
+            # Only bother handling the last presence change for each user
+            new_states_dict = {}
+            for new_state in new_states:
+                new_states_dict[new_state.user_id] = new_state
+            new_state = new_states_dict.values()
+
             for new_state in new_states:
                 user_id = new_state.user_id
 
@@ -651,6 +657,13 @@ class PresenceHandler(object):
                 )
                 continue
 
+            if get_domain_from_id(user_id) != origin:
+                logger.info(
+                    "Got presence update from %r with bad 'user_id': %r",
+                    origin, user_id,
+                )
+                continue
+
             presence_state = push.get("presence", None)
             if not presence_state:
                 logger.info(