xenbus: remove transaction holder from list before freeing

After allocation the item is being placed on the list right away.
Consequently it needs to be taken off the list before freeing in the
case xenbus_dev_request_and_reply() failed, as in that case the
callback (xenbus_dev_queue_reply()) is not being called (and if it
was called, it should do both).

Fixes: 5584ea250ae44f929feb4c7bd3877d1c5edbf813
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>

diff --git a/drivers/xen/xenbus/xenbus_dev_frontend.c b/drivers/xen/xenbus/xenbus_dev_frontend.c
index 1f4733b80c877426fa337e67eebf708b5fb9b41c..f3b089b7c0b62ab22fd2aba11111f9bcecea50cd 100644 (file)
--- a/drivers/xen/xenbus/xenbus_dev_frontend.c
+++ b/drivers/xen/xenbus/xenbus_dev_frontend.c
@@ -442,8 +442,10 @@ static int xenbus_write_transaction(unsigned msg_type,
                return xenbus_command_reply(u, XS_ERROR, "ENOENT");
 
        rc = xenbus_dev_request_and_reply(&u->u.msg, u);
-       if (rc)
+       if (rc && trans) {
+               list_del(&trans->list);
                kfree(trans);
+       }
 
 out:
        return rc;