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MDEV-6736: Valgrind warnings 'Invalid read' in subselect_engine::calc_const_tables with SQ in WHERE and

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HAVING, ORDER BY, materialization+semijoin

During cleanup a pointer to the materialised table that was freed was not set to NULL
This commit is contained in:
Varun Gupta
2018-03-16 18:57:21 +05:30
parent 3d5dff6cae
commit e3dd9a95e5
3 changed files with 35 additions and 1 deletions
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4
sql/sql_select.cc
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@@ -11476,13 +11476,15 @@ 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)
*/
tmp->table= NULL;
table=NULL;
}
DBUG_VOID_RETURN;