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-rw-r--r--changelog.d/7045.misc1
-rw-r--r--synapse/handlers/e2e_room_keys.py7
2 files changed, 8 insertions, 0 deletions
diff --git a/changelog.d/7045.misc b/changelog.d/7045.misc
new file mode 100644
index 0000000000..74c1abea56
--- /dev/null
+++ b/changelog.d/7045.misc
@@ -0,0 +1 @@
+Add a type check to `is_verified` when processing room keys.
diff --git a/synapse/handlers/e2e_room_keys.py b/synapse/handlers/e2e_room_keys.py
index f1b4424a02..9abaf13b8f 100644
--- a/synapse/handlers/e2e_room_keys.py
+++ b/synapse/handlers/e2e_room_keys.py
@@ -207,6 +207,13 @@ class E2eRoomKeysHandler(object):
             changed = False  # if anything has changed, we need to update the etag
             for room_id, room in iteritems(room_keys["rooms"]):
                 for session_id, room_key in iteritems(room["sessions"]):
+                    if not isinstance(room_key["is_verified"], bool):
+                        msg = (
+                            "is_verified must be a boolean in keys for session %s in"
+                            "room %s" % (session_id, room_id)
+                        )
+                        raise SynapseError(400, msg, Codes.INVALID_PARAM)
+
                     log_kv(
                         {
                             "message": "Trying to upload room key",