Alexander Barkov de20091f5c 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.

2020-06-11 09:57:05 +04:00

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