Mark tables 'updating' in sql_acl.cc (mysql_grant(), mysql_table_grant()) so that

tables_ok() does not ignore them. This fixes random bug #980.

sql/sql_acl.cc

@@ -2107,8 +2107,17 @@ int mysql_table_grant(THD *thd, TABLE_LIST *table_list,
     GRANT and REVOKE are applied the slave in/exclusion rules as they are
     some kind of updates to the mysql.% tables.
   */
-  if (thd->slave_thread && table_rules_on && !tables_ok(0, tables))
+  if (thd->slave_thread && table_rules_on)
+  {
+    /* 
+       The tables must be marked "updating" so that tables_ok() takes them into
+       account in tests.
+    */
+    tables[0].updating=tables[1].updating=tables[2].updating=1;
+    if (!tables_ok(0, tables))
       DBUG_RETURN(0);
+    tables[0].updating=tables[1].updating=tables[2].updating=0;
+  }
 #endif
 
   if (open_and_lock_tables(thd,tables))
@@ -2279,8 +2288,17 @@ int mysql_grant (THD *thd, const char *db, List <LEX_USER> &list,
     GRANT and REVOKE are applied the slave in/exclusion rules as they are
     some kind of updates to the mysql.% tables.
   */
-  if (thd->slave_thread && table_rules_on && !tables_ok(0, tables))
+  if (thd->slave_thread && table_rules_on)
+  {
+    /* 
+       The tables must be marked "updating" so that tables_ok() takes them into
+       account in tests.
+    */
+    tables[0].updating=tables[1].updating=1;
+    if (!tables_ok(0, tables))
       DBUG_RETURN(0);
+    tables[0].updating=tables[1].updating=0;
+  }
 #endif
 
   if (open_and_lock_tables(thd,tables))