Memory leak in mysql exploitable by anyone that can read two tables with sufficient rows.
Issue
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Dependent subqueries like :
SELECT COUNT(*) FROM t1, t2 WHERE t2.b IN (SELECT DISTINCT t2.b FROM t2 WHERE t2.b = t1.a)
caused a memory leak proportional to the number of outer rows.
Environment
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Red Hat Enterprise Linux 5.5
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mysql-server-5.0.77-4.el5_5.4
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