linux-kernel - [PATCH v3] usb: usbip: fix a refcount leak in stub

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Message-Id: <20220412020257.9767-1-hbh25y@gmail.com>
Date:   Tue, 12 Apr 2022 10:02:57 +0800
From:   Hangyu Hua <hbh25y@...il.com>
To:     valentina.manea.m@...il.com, shuah@...nel.org,
        gregkh@...uxfoundation.org, khoroshilov@...ras.ru,
        skhan@...uxfoundation.org
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Hangyu Hua <hbh25y@...il.com>
Subject: [PATCH v3] usb: usbip: fix a refcount leak in stub_probe()

usb_get_dev() is called in stub_device_alloc(). When stub_probe() fails
after that, usb_put_dev() needs to be called to release the reference.

Fix this by moving usb_put_dev() to sdev_free error path handling.

Find this by code review.

Fixes: 3ff67445750a ("usbip: fix error handling in stub_probe()")
Signed-off-by: Hangyu Hua <hbh25y@...il.com>
Reviewed-by: Shuah Khan <skhan@...uxfoundation.org>
---

v2: add more description of this patch.

v3: add how to find the problem.

 drivers/usb/usbip/stub_dev.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/usbip/stub_dev.c b/drivers/usb/usbip/stub_dev.c
index d8d3892e5a69..3c6d452e3bf4 100644
--- a/drivers/usb/usbip/stub_dev.c
+++ b/drivers/usb/usbip/stub_dev.c
@@ -393,7 +393,6 @@ static int stub_probe(struct usb_device *udev)
 
 err_port:
 	dev_set_drvdata(&udev->dev, NULL);
-	usb_put_dev(udev);
 
 	/* we already have busid_priv, just lock busid_lock */
 	spin_lock(&busid_priv->busid_lock);
@@ -408,6 +407,7 @@ static int stub_probe(struct usb_device *udev)
 	put_busid_priv(busid_priv);
 
 sdev_free:
+	usb_put_dev(udev);
 	stub_device_free(sdev);
 
 	return rc;
-- 
2.25.1