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Bug#24630 Subselect query crashes mysqld

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The crash happens because second filling of the same I_S table happens in
case of subselect with order by. table->sort.io_cache previously allocated
in create_sort_index() is deleted during second filling
(function get_schema_tables_result). There are two places where
I_S table can be filled: JOIN::exec and create_sort_index().
To fix the bug we should check if the table was already filled
in one of these places and skip processing of the table in second.
This commit is contained in:
gluh@mysql.com/eagle.(none)
2007-02-12 16:06:14 +04:00
parent 0583c7c524
commit 47e537b47c
7 changed files with 93 additions and 13 deletions
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4
sql/sql_select.cc
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@ -1505,7 +1505,7 @@ JOIN::exec()
if ((curr_join->select_lex->options & OPTION_SCHEMA_TABLE) &&
!thd->lex->describe &&
get_schema_tables_result(curr_join))
get_schema_tables_result(curr_join, PROCESSED_BY_JOIN_EXEC))
{
DBUG_VOID_RETURN;
}
@ -12372,7 +12372,7 @@ create_sort_index(THD *thd, JOIN *join, ORDER *order,
/* Fill schema tables with data before filesort if it's necessary */
if ((join->select_lex->options & OPTION_SCHEMA_TABLE) &&
!thd->lex->describe &&
get_schema_tables_result(join))
get_schema_tables_result(join, PROCESSED_BY_CREATE_SORT_INDEX))
goto err;
if (table->s->tmp_table)