On Wed, Feb 09, 2022 at 05:45:00PM +0100, Fabio M. De Francesco wrote:
> Commit 8c67d06f3fd9 ("usb: Link the ports to the connectors they are
> attached to") creates a link to the USB Type-C connector for every new
> port that is added when possible. If component_add() fails,
> usb_hub_create_port_device() prints a warning but does not unregister
> the device and does not return errors to the callers.
>
> Syzbot reported a "WARNING in component_del()".
>
> Fix this issue in usb_hub_create_port_device by calling device_unregister()
> and returning the errors from component_add().
>
> Reported-and-tested-by: syzbot+60df062e1c41940cae0f@xxxxxxxxxxxxxxxxxxxxxxxxx
> Fixes: 8c67d06f3fd9 ("usb: Link the ports to the connectors they are attached to")
> Signed-off-by: Fabio M. De Francesco <fmdefrancesco@xxxxxxxxx>
FWIW:
Reviewed-by: Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
> ---
>
> v1->v2: Move find_and_link_peer() soon after the 'if' test for "retval",
> as suggested by Heikki Krogerus with his review of v1.
>
> drivers/usb/core/port.c | 9 ++++++---
> 1 file changed, 6 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/usb/core/port.c b/drivers/usb/core/port.c
> index c2bbf97a79be..d5bc36ca5b1f 100644
> --- a/drivers/usb/core/port.c
> +++ b/drivers/usb/core/port.c
> @@ -602,11 +602,14 @@ int usb_hub_create_port_device(struct usb_hub *hub, int port1)
> return retval;
> }
>
> - find_and_link_peer(hub, port1);
> -
> retval = component_add(&port_dev->dev, &connector_ops);
> - if (retval)
> + if (retval) {
> dev_warn(&port_dev->dev, "failed to add component\n");
> + device_unregister(&port_dev->dev);
> + return retval;
> + }
> +
> + find_and_link_peer(hub, port1);
>
> /*
> * Enable runtime pm and hold a refernce that hub_configure()
> --
> 2.34.1
--
heikki
