MDEV-25242 Server crashes in check_grant upon invoking function with userstat enabled

also fix index_stats table.

followup for 5a79807119

mysql-test/r/userstat.result

@@ -240,6 +240,8 @@ create function f() returns int return (select 1 from performance_schema.threads
 set global userstat= 1;
 select f() from information_schema.table_statistics;
 ERROR 21000: Subquery returns more than 1 row
+select f() from information_schema.index_statistics;
+ERROR 21000: Subquery returns more than 1 row
 set global userstat= 0;
 drop function f;
 #

mysql-test/t/userstat.test

@@ -121,6 +121,8 @@ create function f() returns int return (select 1 from performance_schema.threads
 set global userstat= 1;
 --error ER_SUBQUERY_NO_1_ROW
 select f() from information_schema.table_statistics;
+--error ER_SUBQUERY_NO_1_ROW
+select f() from information_schema.index_statistics;
 set global userstat= 0;
 drop function f;
 

plugin/userstat/index_stats.cc

@@ -26,7 +26,7 @@ static int index_stats_fill(THD *thd, TABLE_LIST *tables, COND *cond)
     tmp_table.grant.privilege= 0;
     if (check_access(thd, SELECT_ACL, tmp_table.db,
                       &tmp_table.grant.privilege, NULL, 0, 1) ||
-        check_grant(thd, SELECT_ACL, &tmp_table, 1, UINT_MAX, 1))
+        check_grant(thd, SELECT_ACL, &tmp_table, 1, 1, 1))
       continue;
 
     index_name=         strend(tmp_table.table_name)+1;