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A fix and a test case for Bug#34166 Server crash in SHOW OPEN TABLES and

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pre-locking.

The crash was caused by an implicit assumption in check_table_access() that
table_list parameter is always a part of lex->query_tables.

When iterating over the passed list of tables, check_table_access() used
to stop only when lex->query_tables_last_not_own was reached. 
In case of pre-locking, lex->query_tables_last_own is not NULL and points
to some element of lex->query_tables. When the parameter
of check_table_access() was not part of lex->query_tables, loop invariant
could never be violated and a crash would happen when the current table
pointer would point beyond the end of the provided list.

The fix is to change the signature of check_table_access() to also accept
a numeric limit of loop iterations, similarly to check_grant(), and 
supply this limit in all places when we want to check access of tables
that are outside lex->query_tables, or just want to check access to one table.
This commit is contained in:
kostja@dipika.(none)
2008-01-30 18:27:41 +03:00
parent 960c243457
commit b46ce80902
13 changed files with 94 additions and 53 deletions
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6
sql/sql_show.cc
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@ -4059,7 +4059,7 @@ int fill_schema_proc(THD *thd, TABLE_LIST *tables, COND *cond)
proc_tables.table_name= proc_tables.alias= (char*) "proc";
proc_tables.table_name_length= 4;
proc_tables.lock_type= TL_READ;
full_access= !check_table_access(thd, SELECT_ACL, &proc_tables, 1);
full_access= !check_table_access(thd, SELECT_ACL, &proc_tables, 1, TRUE);
if (!(proc_table= open_proc_table_for_read(thd, &open_tables_state_backup)))
{
DBUG_RETURN(1);
@ -4447,10 +4447,8 @@ static int get_schema_triggers_record(THD *thd, TABLE_LIST *tables,
Table_triggers_list *triggers= tables->table->triggers;
int event, timing;
#ifndef NO_EMBEDDED_ACCESS_CHECKS
if (check_table_access(thd, TRIGGER_ACL, tables, 1))
if (check_table_access(thd, TRIGGER_ACL, tables, 1, TRUE))
goto ret;
#endif
for (event= 0; event < (int)TRG_EVENT_MAX; event++)
{