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Avoid mutating cached room aliases. (#15038)

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This might cause incorrect data in other callers which
are not expecting the canonical alias to be added into
the response.
This commit is contained in:
Patrick Cloke 2023-02-09 10:56:02 -05:00 committed by GitHub
parent 733531ee3e
commit 8a6e043488
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2 changed files with 3 additions and 1 deletions
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changelog.d/15038.bugfix Normal file
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@ -0,0 +1 @@
Fix a long-standing bug where the room aliases returned could be corrupted.

3
synapse/handlers/directory.py
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@ -485,7 +485,8 @@ class DirectoryHandler:
)
)
if canonical_alias:
room_aliases.append(canonical_alias)
# Ensure we do not mutate room_aliases.
room_aliases = room_aliases + [canonical_alias]
if not self.config.roomdirectory.is_publishing_room_allowed(
user_id, room_id, room_aliases