usb: typec: ucsi: Don't attempt to resume the ports before they exist

This will fix null pointer dereference that was caused by
the driver attempting to resume ports that were not yet
registered.

Fixes: e0dced9c7d47 ("usb: typec: ucsi: Resume in separate work")
Cc: <stable@vger.kernel.org>
Link: https://bugzilla.kernel.org/show_bug.cgi?id=216697
Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://lore.kernel.org/r/20230131141518.78215-1-heikki.krogerus@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/typec/ucsi/ucsi.c b/drivers/usb/typec/ucsi/ucsi.c
index 1292241..1cf8947 100644 (file)
--- a/drivers/usb/typec/ucsi/ucsi.c
+++ b/drivers/usb/typec/ucsi/ucsi.c
@@ -1269,6 +1269,9 @@ err_unregister:
                con->port = NULL;
        }
 
+       kfree(ucsi->connector);
+       ucsi->connector = NULL;
+
 err_reset:
        memset(&ucsi->cap, 0, sizeof(ucsi->cap));
        ucsi_reset_ppm(ucsi);
@@ -1300,7 +1303,8 @@ static void ucsi_resume_work(struct work_struct *work)
 
 int ucsi_resume(struct ucsi *ucsi)
 {
-       queue_work(system_long_wq, &ucsi->resume_work);
+       if (ucsi->connector)
+               queue_work(system_long_wq, &ucsi->resume_work);
        return 0;
 }
 EXPORT_SYMBOL_GPL(ucsi_resume);
@@ -1420,6 +1424,9 @@ void ucsi_unregister(struct ucsi *ucsi)
        /* Disable notifications */
        ucsi->ops->async_write(ucsi, UCSI_CONTROL, &cmd, sizeof(cmd));
 
+       if (!ucsi->connector)
+               return;
+
        for (i = 0; i < ucsi->cap.num_connectors; i++) {
                cancel_work_sync(&ucsi->connector[i].work);
                ucsi_unregister_partner(&ucsi->connector[i]);