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MDEV-14817 Server crashes in prep_alter_part_table() after table lock and multiple add partition [fixes #440]

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Cause: `table->part_info` is stale after `prep_alter_part_table()` while
`table->m_needs_reopen == true`.

Fix: restore `table->part_info` in case of error in `prep_alter_part_table()`.

Tested with main, parts, innodb suites.
This commit is contained in:
Aleksey Midenkov
2018-01-03 19:47:01 +03:00
parent dbf21ff396
commit daf883f95c
4 changed files with 35 additions and 2 deletions
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16
sql/sql_partition.cc
View File

@ -4573,6 +4573,8 @@ uint prep_alter_part_table(THD *thd, TABLE *table, Alter_info *alter_info,
/* ALTER_ADMIN_PARTITION is handled in mysql_admin_table */
DBUG_ASSERT(!(alter_info->flags & Alter_info::ALTER_ADMIN_PARTITION));
partition_info *saved_part_info= NULL;
if (alter_info->flags &
(Alter_info::ALTER_ADD_PARTITION |
Alter_info::ALTER_DROP_PARTITION |
@ -4778,6 +4780,16 @@ uint prep_alter_part_table(THD *thd, TABLE *table, Alter_info *alter_info,
}
if (alter_info->flags & Alter_info::ALTER_ADD_PARTITION)
{
if (*fast_alter_table && thd->locked_tables_mode)
{
MEM_ROOT *old_root= thd->mem_root;
thd->mem_root= &thd->locked_tables_list.m_locked_tables_root;
saved_part_info= tab_part_info->get_clone(thd);
thd->mem_root= old_root;
saved_part_info->read_partitions= tab_part_info->read_partitions;
saved_part_info->lock_partitions= tab_part_info->lock_partitions;
saved_part_info->bitmaps_are_initialized= tab_part_info->bitmaps_are_initialized;
}
/*
We start by moving the new partitions to the list of temporary
partitions. We will then check that the new partitions fit in the
@ -5472,7 +5484,7 @@ the generated partition syntax in a correct manner.
goto err;
}
}
}
} // ADD, DROP, COALESCE, REORGANIZE, TABLE_REORG, REBUILD
else
{
/*
@ -5638,6 +5650,8 @@ the generated partition syntax in a correct manner.
DBUG_RETURN(FALSE);
err:
*fast_alter_table= false;
if (saved_part_info)
table->part_info= saved_part_info;
DBUG_RETURN(TRUE);
}