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MDEV-9898 SET ROLE NONE can crash mysqld.
The check_user_can_set_role() used find_user_exact() to get the permissions for the SET ROLE NONE command. Which returned NULL too often, for instance when user authenticated as 'user'@'%'. Now we use find_user_wild() instead.
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Alexey Botchkov
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May 2, 2016
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