On Sat, 18 May 2019, syzbot wrote: > Hello, > > syzbot tried to test the proposed patch but build/boot failed: One of these times I'll get it right... Alan Stern #syz test: https://github.com/google/kasan.git usb-fuzzer drivers/net/wireless/intersil/p54/p54usb.c | 37 +++++++++++------------------ 1 file changed, 15 insertions(+), 22 deletions(-) Index: usb-devel/drivers/net/wireless/intersil/p54/p54usb.c =================================================================== --- usb-devel.orig/drivers/net/wireless/intersil/p54/p54usb.c +++ usb-devel/drivers/net/wireless/intersil/p54/p54usb.c @@ -33,6 +33,8 @@ MODULE_ALIAS("prism54usb"); MODULE_FIRMWARE("isl3886usb"); MODULE_FIRMWARE("isl3887usb"); +static struct usb_driver p54u_driver; + /* * Note: * @@ -921,9 +923,9 @@ static void p54u_load_firmware_cb(const { struct p54u_priv *priv = context; struct usb_device *udev = priv->udev; + struct usb_interface *intf = priv->intf; int err; - complete(&priv->fw_wait_load); if (firmware) { priv->fw = firmware; err = p54u_start_ops(priv); @@ -932,23 +934,19 @@ static void p54u_load_firmware_cb(const dev_err(&udev->dev, "Firmware not found.\n"); } - if (err) { - struct device *parent = priv->udev->dev.parent; - - dev_err(&udev->dev, "failed to initialize device (%d)\n", err); - - if (parent) - device_lock(parent); + complete(&priv->fw_wait_load); + /* + * At this point p54u_disconnect may have already freed + * the "priv" context. Do not use it anymore! + */ + priv = NULL; - device_release_driver(&udev->dev); - /* - * At this point p54u_disconnect has already freed - * the "priv" context. Do not use it anymore! - */ - priv = NULL; + if (err) { + dev_err(&intf->dev, "failed to initialize device (%d)\n", err); - if (parent) - device_unlock(parent); + usb_lock_device(udev); + usb_driver_release_interface(&p54u_driver, intf); + usb_unlock_device(udev); } usb_put_dev(udev); @@ -1011,8 +1009,6 @@ static int p54u_probe(struct usb_interfa skb_queue_head_init(&priv->rx_queue); init_usb_anchor(&priv->submitted); - usb_get_dev(udev); - /* really lazy and simple way of figuring out if we're a 3887 */ /* TODO: should just stick the identification in the device table */ i = intf->altsetting->desc.bNumEndpoints; @@ -1053,10 +1049,8 @@ static int p54u_probe(struct usb_interfa priv->upload_fw = p54u_upload_firmware_net2280; } err = p54u_load_firmware(dev, intf); - if (err) { - usb_put_dev(udev); + if (err) p54_free_common(dev); - } return err; } @@ -1072,7 +1066,6 @@ static void p54u_disconnect(struct usb_i wait_for_completion(&priv->fw_wait_load); p54_unregister_common(dev); - usb_put_dev(interface_to_usbdev(intf)); release_firmware(priv->fw); p54_free_common(dev); }
