linux-kernel - [PATCH 5.15 013/247] usb: usbip: add missing device lock on tweak configuration cmd

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Date:   Mon, 13 Jun 2022 12:08:35 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Shuah Khan <skhan@...uxfoundation.org>,
        Niels Dossche <dossche.niels@...il.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.15 013/247] usb: usbip: add missing device lock on tweak configuration cmd

From: Niels Dossche <dossche.niels@...il.com>

[ Upstream commit d088fabace2ca337b275d1d4b36db4fe7771e44f ]

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@...uxfoundation.org>
Signed-off-by: Niels Dossche <dossche.niels@...il.com>
Link: https://lore.kernel.org/r/20220412165055.257113-1-dossche.niels@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/usb/usbip/stub_rx.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/usb/usbip/stub_rx.c b/drivers/usb/usbip/stub_rx.c
index 325c22008e53..5dd41e8215e0 100644
--- 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);
-- 
2.35.1