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Fix missing null character check on guest_access room state (#8373)

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When updating the `room_stats_state` table, we try to check for null bytes slipping in to the content for state events. It turns out we had added `guest_access` as a field to room_stats_state without including it in the null byte check.

Lo and behold, a null byte in a `m.room.guest_access` event then breaks `room_stats_state` updates.

This PR adds the check for `guest_access`.
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Andrew Morgan 2020-09-23 15:58:20 +01:00 committed by GitHub
commit 4bb203ea4f
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changelog.d/8373.bugfix Normal file
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@ -0,0 +1 @@
Include `guest_access` in the fields that are checked for null bytes when updating `room_stats_state`. Broke in v1.7.2.

2
synapse/storage/databases/main/stats.py
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@ -210,6 +210,7 @@ class StatsStore(StateDeltasStore):
* topic
* avatar
* canonical_alias
* guest_access
A is_federatable key can also be included with a boolean value.
@ -234,6 +235,7 @@ class StatsStore(StateDeltasStore):
"topic",
"avatar",
"canonical_alias",
"guest_access",
):
field = fields.get(col, sentinel)
if field is not sentinel and (not isinstance(field, str) or "\0" in field):