usb: usbip: add missing device lock on tweak configuration cmd

The function documentation of usb_set_configuration says that its
callers should hold the device lock. This lock is held for all
callsites except tweak_set_configuration_cmd. The code path can be
executed for example when attaching a remote USB device.
The solution is to surround the call by the device lock.

This bug was found using my experimental own-developed static analysis
tool, which reported the missing lock on v5.17.2. I manually verified
this bug report by doing code review as well. I runtime checked that
the required lock is not held. I compiled and runtime tested this on
x86_64 with a USB mouse. After applying this patch, my analyser no
longer reports this potential bug.

Fixes: 2c8c98158946 ("staging: usbip: let client choose device configuration")
Reviewed-by: Shuah Khan <skhan@linuxfoundation.org>
Signed-off-by: Niels Dossche <dossche.niels@gmail.com>
Link: https://lore.kernel.org/r/20220412165055.257113-1-dossche.niels@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/usbip/stub_rx.c b/drivers/usb/usbip/stub_rx.c
index 325c220..5dd41e8 100644 (file)
--- a/drivers/usb/usbip/stub_rx.c
+++ b/drivers/usb/usbip/stub_rx.c
@@ -138,7 +138,9 @@ static int tweak_set_configuration_cmd(struct urb *urb)
        req = (struct usb_ctrlrequest *) urb->setup_packet;
        config = le16_to_cpu(req->wValue);
 
+       usb_lock_device(sdev->udev);
        err = usb_set_configuration(sdev->udev, config);
+       usb_unlock_device(sdev->udev);
        if (err && err != -ENODEV)
                dev_err(&sdev->udev->dev, "can't set config #%d, error %d\n",
                        config, err);