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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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2
sql/sql_trigger.cc
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@ -418,7 +418,7 @@ bool mysql_create_or_drop_trigger(THD *thd, TABLE_LIST *tables, bool create)
TABLE_LIST **save_query_tables_own_last= thd->lex->query_tables_own_last;
thd->lex->query_tables_own_last= 0;
err_status= check_table_access(thd, TRIGGER_ACL, tables, 0);
err_status= check_table_access(thd, TRIGGER_ACL, tables, 1, FALSE);
thd->lex->query_tables_own_last= save_query_tables_own_last;