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Make sure prev_ids defaults to empty list #12829

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May 25, 2022
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Make sure prev_ids defaults to empty list #12829

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87a686b
Raise error if `prev_ids` is not a list
carlbordum May 21, 2022
cc22e56
Update changelog.d/12829.bugfix
erikjohnston May 25, 2022
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2 changes: 2 additions & 0 deletions changelog.d/12829.bugfix
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Original file line number Diff line number Diff line change
@@ -0,0 +1,2 @@
Fixed a bug where device list updates over federation would fail if they
were not a list. Contributed by Carl Bordum Hansen.
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4 changes: 4 additions & 0 deletions synapse/handlers/device.py
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Expand Up @@ -763,6 +763,10 @@ async def incoming_device_list_update(
device_id = edu_content.pop("device_id")
stream_id = str(edu_content.pop("stream_id")) # They may come as ints
prev_ids = edu_content.pop("prev_id", [])
if not isinstance(prev_ids, list):
raise SynapseError(
400, "Device list update had an invalid 'prev_ids' field"
)
prev_ids = [str(p) for p in prev_ids] # They may come as ints

if get_domain_from_id(user_id) != origin:
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