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MDEV-22755 CREATE USER leads to indirect SIGABRT in __stack_chk_fail …
…() from fill_schema_user_privileges + *** stack smashing detected *** (on optimized builds) The code erroneously used buff[100] in a fiew places to make a GRANTEE value in the form: 'user'@'host' Fix: - Fixing the code to use (USER_HOST_BUFF_SIZE + 6) instead of 100. - Adding a DBUG_ASSERT to make sure the buffer is enough - Wrapping the code into a class Grantee_str, to reuse it easier in 4 places.
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