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bug in JOIN_TAB::cleanup() that caused freed memory to be accessed

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This commit is contained in:
Monty
2015-09-27 21:28:07 +02:00
committed by Sergei Golubchik
parent 4193fa7ae2
commit 8ed5fde3e1
1 changed files with 4 additions and 2 deletions
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6
sql/sql_select.cc
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@ -11472,14 +11472,16 @@ void JOIN_TAB::cleanup()
}
else
{
TABLE_LIST *tmp= table->pos_in_table_list;
end_read_record(&read_record);
table->pos_in_table_list->jtbm_subselect->cleanup();
tmp->jtbm_subselect->cleanup();
/*
The above call freed the materializedd temptable. Set it to NULL so
that we don't attempt to touch it if JOIN_TAB::cleanup() is invoked
multiple times (it may be)
*/
table=NULL;
tmp->table= NULL;
table= NULL;
}
DBUG_VOID_RETURN;
}