[MDEV-12696] Crash with LOAD XML and non-updatable VIEW column - Jira

I dump some data into an XML file:

mysql --xml -e "SELECT 'test' AS c1" >/tmp/dump.xml

Now I create table and a view with a non-updatable column:

CREATE OR REPLACE TABLE t1 (c1 TEXT);

CREATE OR REPLACE VIEW v1 AS SELECT CONCAT(c1,'') AS c1 FROM t1;

And try to load data into it:

LOAD XML INFILE '/tmp/dump.xml' INTO TABLE v1 (c1);

The server crashed, either immediately, or on the next query.

The crash happens because read_xml_field casts item to Item_user_var_as_out_param without checking for proper Item type, in these two places:

        else

          ((Item_user_var_as_out_param *) item)->set_null_value(cs);

...

      else

        ((Item_user_var_as_out_param *) item)->set_value(

                                                 (char *) tag->value.ptr(),

                                                 tag->value.length(), cs);

Transition	Time In Source Status	Execution Times

Alexander Barkov made transition - 2017-05-05 06:55

Open

In Progress

2h 13m

Alexander Barkov made transition - 2017-05-05 07:06

In Progress

Closed

11m 17s

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