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MDEV-17896 Assertion `pfs->get_refcount() > 0' failed

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Unfortunate DROP TEMPORARY..IF EXISTS on a regular table may allow
subsequent CREATE TABLE statements to steal away the PFS_table_share
instance from the dropped table.
This commit is contained in:
Robert Bindar
2019-10-10 12:58:29 +03:00
parent d925aec1c1
commit 6f86150ab3
3 changed files with 71 additions and 0 deletions
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7
sql/sql_table.cc
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@ -2418,6 +2418,13 @@ int mysql_rm_table_no_locks(THD *thd, TABLE_LIST *tables, bool if_exists,
ER_BAD_TABLE_ERROR,
ER_THD(thd, ER_BAD_TABLE_ERROR),
tbl_name.c_ptr_safe());
/*
Our job is done here. This statement was added to avoid executing
unnecessary code farther below which in some strange corner cases
caused the server to crash (see MDEV-17896).
*/
continue;
}
else
{