User-supplied CODEOWNERS patterns were compiled without a match timeout,
so a crafted pattern (e.g. (a+)+) against a crafted file path could
backtrack for tens of seconds inside the PR creation transaction and
exhaust the database connection pool. Set MatchTimeout on each compiled
rule; the caller already treats match errors as non-matches.
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Signed-off-by: wxiaoguang <wxiaoguang@gmail.com>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
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