database/mariadb
1
0
Fork 0
mirror of https://github.com/MariaDB/server.git synced 2025-07-29 05:21:33 +03:00
Code Activity

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

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

2
sql/sql_acl.cc
View File

@ -3862,7 +3862,7 @@ bool check_grant(THD *thd, ulong want_access, TABLE_LIST *tables,
of other queries). For simple queries first_not_own_table is 0.
*/
for (i= 0, table= tables;
table != first_not_own_table && i < number;
i < number && table != first_not_own_table;
table= table->next_global, i++)
{
/* Remove SHOW_VIEW_ACL, because it will be checked during making view */