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-rw-r--r--changelog.d/10015.bugfix1
-rw-r--r--synapse/storage/databases/main/devices.py10
2 files changed, 9 insertions, 2 deletions
diff --git a/changelog.d/10015.bugfix b/changelog.d/10015.bugfix
new file mode 100644
index 0000000000..cbebd97e58
--- /dev/null
+++ b/changelog.d/10015.bugfix
@@ -0,0 +1 @@
+Prevent device names from appearing in device list updates when `allow_device_name_lookup_over_federation` is `false`.
\ No newline at end of file
diff --git a/synapse/storage/databases/main/devices.py b/synapse/storage/databases/main/devices.py
index 18358eca46..830b076a32 100644
--- a/synapse/storage/databases/main/devices.py
+++ b/synapse/storage/databases/main/devices.py
@@ -539,9 +539,11 @@ class DeviceWorkerStore(RoomMemberWorkerStore, EndToEndKeyWorkerStore):
                     "device_id": device_id,
                     "prev_id": [prev_id] if prev_id else [],
                     "stream_id": stream_id,
-                    "org.matrix.opentracing_context": opentracing_context,
                 }
 
+                if opentracing_context != "{}":
+                    result["org.matrix.opentracing_context"] = opentracing_context
+
                 prev_id = stream_id
 
                 if device is not None:
@@ -549,7 +551,11 @@ class DeviceWorkerStore(RoomMemberWorkerStore, EndToEndKeyWorkerStore):
                     if keys:
                         result["keys"] = keys
 
-                    device_display_name = device.display_name
+                    device_display_name = None
+                    if (
+                        self.hs.config.federation.allow_device_name_lookup_over_federation
+                    ):
+                        device_display_name = device.display_name
                     if device_display_name:
                         result["device_display_name"] = device_display_name
                 else: