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| -rw-r--r-- | changelog.d/12829.bugfix | 1 | ||||
| -rw-r--r-- | synapse/handlers/device.py | 4 |
2 files changed, 5 insertions, 0 deletions
diff --git a/changelog.d/12829.bugfix b/changelog.d/12829.bugfix new file mode 100644 index 0000000000..dfa1fed34e --- /dev/null +++ b/changelog.d/12829.bugfix @@ -0,0 +1 @@ +Fix a bug where we did not correctly handle invalid device list updates over federation. Contributed by Carl Bordum Hansen. diff --git a/synapse/handlers/device.py b/synapse/handlers/device.py index 1d6d1f8a92..e59937fd75 100644 --- a/synapse/handlers/device.py +++ b/synapse/handlers/device.py @@ -763,6 +763,10 @@ class DeviceListUpdater: 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: |