From: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> commit 720ac467204a70308bd687927ed475afb904e11b upstream. The wacom driver accepts devices of more than just USB types, but some code paths can cause problems if the device being controlled is not a USB device due to a lack of checking. Add the needed checks to ensure that the USB device accesses are only happening on a "real" USB device, and not one on some other bus. Cc: Jiri Kosina <jikos@xxxxxxxxxx> Cc: Benjamin Tissoires <benjamin.tissoires@xxxxxxxxxx> Cc: linux-input@xxxxxxxxxxxxxxx Cc: stable@xxxxxxxxxxxxxxx Tested-by: Benjamin Tissoires <benjamin.tissoires@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> Signed-off-by: Benjamin Tissoires <benjamin.tissoires@xxxxxxxxxx> Link: https://lore.kernel.org/r/20211201183503.2373082-2-gregkh@xxxxxxxxxxxxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/hid/wacom_sys.c | 17 ++++++++++++----- 1 file changed, 12 insertions(+), 5 deletions(-) --- a/drivers/hid/wacom_sys.c +++ b/drivers/hid/wacom_sys.c @@ -506,7 +506,7 @@ static void wacom_retrieve_hid_descripto * Skip the query for this type and modify defaults based on * interface number. */ - if (features->type == WIRELESS) { + if (features->type == WIRELESS && intf) { if (intf->cur_altsetting->desc.bInterfaceNumber == 0) features->device_type = WACOM_DEVICETYPE_WL_MONITOR; else @@ -2115,6 +2115,9 @@ static void wacom_wireless_work(struct w wacom_destroy_battery(wacom); + if (!usbdev) + return; + /* Stylus interface */ hdev1 = usb_get_intfdata(usbdev->config->interface[1]); wacom1 = hid_get_drvdata(hdev1); @@ -2354,8 +2357,6 @@ static void wacom_remote_work(struct wor static int wacom_probe(struct hid_device *hdev, const struct hid_device_id *id) { - struct usb_interface *intf = to_usb_interface(hdev->dev.parent); - struct usb_device *dev = interface_to_usbdev(intf); struct wacom *wacom; struct wacom_wac *wacom_wac; struct wacom_features *features; @@ -2388,8 +2389,14 @@ static int wacom_probe(struct hid_device wacom_wac->hid_data.inputmode = -1; wacom_wac->mode_report = -1; - wacom->usbdev = dev; - wacom->intf = intf; + if (hid_is_usb(hdev)) { + struct usb_interface *intf = to_usb_interface(hdev->dev.parent); + struct usb_device *dev = interface_to_usbdev(intf); + + wacom->usbdev = dev; + wacom->intf = intf; + } + mutex_init(&wacom->lock); INIT_WORK(&wacom->wireless_work, wacom_wireless_work); INIT_WORK(&wacom->battery_work, wacom_battery_work);
