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mariadb.29762
CVE-2022-32084.patch
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File CVE-2022-32084.patch of Package mariadb.29762
From 49e14000eeb245ea27e9207d2f63cb0a28be1ca9 Mon Sep 17 00:00:00 2001 From: Oleg Smirnov <olernov@gmail.com> Date: Sat, 18 Jun 2022 20:54:39 +0700 Subject: [PATCH] MDEV-26427 MariaDB Server SEGV on INSERT .. SELECT 1. For INSERT..SELECT statements: don't include table/view the data is inserted into in the list of leaf tables 2. Remove duplicated and dead code related to table_count --- mysql-test/main/insert_select.result | 70 +++++++++++ mysql-test/main/insert_select.test | 54 ++++++++ mysql-test/main/view.result | 10 ++ mysql-test/main/view.test | 2 + sql/sql_base.cc | 178 +++++++++++++++++++-------- sql/sql_insert.cc | 4 +- sql/sql_select.cc | 4 - sql/sql_select.h | 1 - 8 files changed, 264 insertions(+), 59 deletions(-) Index: mariadb-10.2.44/sql/sql_base.cc =================================================================== --- mariadb-10.2.44.orig/sql/sql_base.cc +++ mariadb-10.2.44/sql/sql_base.cc @@ -7309,46 +7309,118 @@ bool setup_fields(THD *thd, Ref_ptr_arra DBUG_RETURN(MY_TEST(thd->is_error())); } +/* + make list of leaves for a single TABLE_LIST + + SYNOPSIS + make_leaves_for_single_table() + thd Thread handler + leaves List of leaf tables to be filled + table TABLE_LIST object to process + full_table_list Whether to include tables from mergeable derived table/view +*/ +void make_leaves_for_single_table(THD *thd, List<TABLE_LIST> &leaves, + TABLE_LIST *table, bool& full_table_list, + TABLE_LIST *boundary) +{ + if (table == boundary) + full_table_list= !full_table_list; + if (full_table_list && table->is_merged_derived()) + { + SELECT_LEX *select_lex= table->get_single_select(); + /* + It's safe to use select_lex->leaf_tables because all derived + tables/views were already prepared and has their leaf_tables + set properly. + */ + make_leaves_list(thd, leaves, select_lex->get_table_list(), + full_table_list, boundary); + } + else + { + leaves.push_back(table, thd->mem_root); + } +} + /* make list of leaves of join table tree SYNOPSIS make_leaves_list() - list pointer to pointer on list first element - tables table list - full_table_list whether to include tables from mergeable derived table/view. - we need them for checks for INSERT/UPDATE statements only. - - RETURN pointer on pointer to next_leaf of last element + leaves List of leaf tables to be filled + tables Table list + full_table_list Whether to include tables from mergeable derived table/view. + We need them for checks for INSERT/UPDATE statements only. */ -void make_leaves_list(THD *thd, List<TABLE_LIST> &list, TABLE_LIST *tables, +void make_leaves_list(THD *thd, List<TABLE_LIST> &leaves, TABLE_LIST *tables, bool full_table_list, TABLE_LIST *boundary) { for (TABLE_LIST *table= tables; table; table= table->next_local) { - if (table == boundary) - full_table_list= !full_table_list; - if (full_table_list && table->is_merged_derived()) - { - SELECT_LEX *select_lex= table->get_single_select(); - /* - It's safe to use select_lex->leaf_tables because all derived - tables/views were already prepared and has their leaf_tables - set properly. - */ - make_leaves_list(thd, list, select_lex->get_table_list(), - full_table_list, boundary); - } - else - { - list.push_back(table, thd->mem_root); - } + make_leaves_for_single_table(thd, leaves, table, full_table_list, + boundary); } } + +/* + Setup the map and other attributes for a single TABLE_LIST object + + SYNOPSIS + setup_table_attributes() + thd Thread handler + table_list TABLE_LIST object to process + first_select_table First table participating in SELECT for INSERT..SELECT + statements, NULL for other cases + tablenr Serial number of the table in the SQL statement + + RETURN + false Success + true Failure +*/ +bool setup_table_attributes(THD *thd, TABLE_LIST *table_list, + TABLE_LIST *first_select_table, + uint &tablenr) +{ + TABLE *table= table_list->table; + if (table) + table->pos_in_table_list= table_list; + if (first_select_table && table_list->top_table() == first_select_table) + { + /* new counting for SELECT of INSERT ... SELECT command */ + first_select_table= 0; + thd->lex->select_lex.insert_tables= tablenr; + tablenr= 0; + } + if (table_list->jtbm_subselect) + { + table_list->jtbm_table_no= tablenr; + } + else if (table) + { + table->pos_in_table_list= table_list; + setup_table_map(table, table_list, tablenr); + + if (table_list->process_index_hints(table)) + return true; + } + tablenr++; + /* + We test the max tables here as we setup_table_map() should not be called + with tablenr >= 64 + */ + if (tablenr > MAX_TABLES) + { + my_error(ER_TOO_MANY_TABLES, MYF(0), static_cast<int>(MAX_TABLES)); + return true; + } + return false; +} + + /* prepare tables @@ -7405,7 +7477,14 @@ bool setup_tables(THD *thd, Name_resolut leaves.empty(); if (select_lex->prep_leaf_list_state != SELECT_LEX::SAVED) { - make_leaves_list(thd, leaves, tables, full_table_list, first_select_table); + /* + For INSERT ... SELECT statements we must not include the first table + (where the data is being inserted into) in the list of leaves + */ + TABLE_LIST *tables_for_leaves= + select_insert ? first_select_table : tables; + make_leaves_list(thd, leaves, tables_for_leaves, full_table_list, + first_select_table); select_lex->prep_leaf_list_state= SELECT_LEX::READY; select_lex->leaf_tables_exec.empty(); } @@ -7416,37 +7495,34 @@ bool setup_tables(THD *thd, Name_resolut leaves.push_back(table_list, thd->mem_root); } + List_iterator<TABLE_LIST> ti(leaves); while ((table_list= ti++)) { - TABLE *table= table_list->table; - if (table) - table->pos_in_table_list= table_list; - if (first_select_table && - table_list->top_table() == first_select_table) - { - /* new counting for SELECT of INSERT ... SELECT command */ - first_select_table= 0; - thd->lex->select_lex.insert_tables= tablenr; - tablenr= 0; - } - if(table_list->jtbm_subselect) - { - table_list->jtbm_table_no= tablenr; - } - else if (table) - { - table->pos_in_table_list= table_list; - setup_table_map(table, table_list, tablenr); + if (setup_table_attributes(thd, table_list, first_select_table, tablenr)) + DBUG_RETURN(1); + } + + if (select_insert) + { + /* + The table/view in which the data is inserted must not be included into + the leaf_tables list. But we need this table/view to setup attributes + for it. So build a temporary list of leaves and setup attributes for + the tables included + */ + List<TABLE_LIST> leaves; + TABLE_LIST *table= tables; - if (table_list->process_index_hints(table)) + make_leaves_for_single_table(thd, leaves, table, full_table_list, + first_select_table); + + List_iterator<TABLE_LIST> ti(leaves); + while ((table_list= ti++)) + { + if (setup_table_attributes(thd, table_list, first_select_table, + tablenr)) DBUG_RETURN(1); } - tablenr++; - } - if (tablenr > MAX_TABLES) - { - my_error(ER_TOO_MANY_TABLES,MYF(0), static_cast<int>(MAX_TABLES)); - DBUG_RETURN(1); } } else Index: mariadb-10.2.44/sql/sql_insert.cc =================================================================== --- mariadb-10.2.44.orig/sql/sql_insert.cc +++ mariadb-10.2.44/sql/sql_insert.cc @@ -1419,8 +1419,7 @@ static bool mysql_prepare_insert_check_t if (insert_into_view && !fields.elements) { thd->lex->empty_field_list_on_rset= 1; - if (!thd->lex->select_lex.leaf_tables.head()->table || - table_list->is_multitable()) + if (!table_list->table || table_list->is_multitable()) { my_error(ER_VIEW_NO_INSERT_FIELD_LIST, MYF(0), table_list->view_db.str, table_list->view_name.str); @@ -3537,7 +3536,6 @@ bool mysql_insert_select_prepare(THD *th &select_lex->where, TRUE)) DBUG_RETURN(TRUE); - DBUG_ASSERT(select_lex->leaf_tables.elements != 0); List_iterator<TABLE_LIST> ti(select_lex->leaf_tables); TABLE_LIST *table; uint insert_tables; Index: mariadb-10.2.44/sql/sql_select.cc =================================================================== --- mariadb-10.2.44.orig/sql/sql_select.cc +++ mariadb-10.2.44/sql/sql_select.cc @@ -1237,7 +1237,6 @@ JOIN::optimize_inner() /* Merge all mergeable derived tables/views in this SELECT. */ if (select_lex->handle_derived(thd->lex, DT_MERGE)) DBUG_RETURN(TRUE); - table_count= select_lex->leaf_tables.elements; } // Update used tables after all handling derived table procedures select_lex->update_used_tables(); @@ -1275,8 +1274,6 @@ JOIN::optimize_inner() eval_select_list_used_tables(); - table_count= select_lex->leaf_tables.elements; - if (setup_ftfuncs(select_lex)) /* should be after having->fix_fields */ DBUG_RETURN(-1); @@ -12381,7 +12378,6 @@ void JOIN::cleanup(bool full) /* Free the original optimized join created for the group_by_handler */ join_tab= original_join_tab; original_join_tab= 0; - table_count= original_table_count; } if (join_tab) Index: mariadb-10.2.44/sql/sql_select.h =================================================================== --- mariadb-10.2.44.orig/sql/sql_select.h +++ mariadb-10.2.44/sql/sql_select.h @@ -1178,7 +1178,6 @@ public: Pushdown_query *pushdown_query; JOIN_TAB *original_join_tab; - uint original_table_count; /******* Join optimization state members start *******/ /*
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