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Diffstat (limited to 'synapse/rest/client/login.py')
| -rw-r--r-- | synapse/rest/client/login.py | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/synapse/rest/client/login.py b/synapse/rest/client/login.py index c9d44c5964..4a4dbe75de 100644 --- a/synapse/rest/client/login.py +++ b/synapse/rest/client/login.py @@ -342,6 +342,15 @@ class LoginRestServlet(RestServlet): user_id = canonical_uid device_id = login_submission.get("device_id") + + # If device_id is present, check that device_id is not longer than a reasonable 512 characters + if device_id and len(device_id) > 512: + raise LoginError( + 400, + "device_id cannot be longer than 512 characters.", + errcode=Codes.INVALID_PARAM, + ) + initial_display_name = login_submission.get("initial_device_display_name") ( device_id, |