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-rw-r--r--changelog.d/6844.bugfix1
-rw-r--r--synapse/storage/data_stores/main/devices.py10
2 files changed, 11 insertions, 0 deletions
diff --git a/changelog.d/6844.bugfix b/changelog.d/6844.bugfix
new file mode 100644
index 0000000000..e84aa1029f
--- /dev/null
+++ b/changelog.d/6844.bugfix
@@ -0,0 +1 @@
+Fix an issue with cross-signing where device signatures were not sent to remote servers.
diff --git a/synapse/storage/data_stores/main/devices.py b/synapse/storage/data_stores/main/devices.py
index ea0503476f..b7617efb80 100644
--- a/synapse/storage/data_stores/main/devices.py
+++ b/synapse/storage/data_stores/main/devices.py
@@ -320,6 +320,11 @@ class DeviceWorkerStore(SQLBaseStore):
                     device_display_name = device.get("device_display_name", None)
                     if device_display_name:
                         result["device_display_name"] = device_display_name
+                    if "signatures" in device:
+                        for sig_user_id, sigs in device["signatures"].items():
+                            result["keys"].setdefault("signatures", {}).setdefault(
+                                sig_user_id, {}
+                            ).update(sigs)
                 else:
                     result["deleted"] = True
 
@@ -524,6 +529,11 @@ class DeviceWorkerStore(SQLBaseStore):
                 device_display_name = device.get("device_display_name", None)
                 if device_display_name:
                     result["device_display_name"] = device_display_name
+                if "signatures" in device:
+                    for sig_user_id, sigs in device["signatures"].items():
+                        result["keys"].setdefault("signatures", {}).setdefault(
+                            sig_user_id, {}
+                        ).update(sigs)
 
                 results.append(result)