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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Shuah Khan <skhan@linuxfoundation.org>,
        Hangyu Hua <hbh25y@gmail.com>, Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.19 192/287] usb: usbip: fix a refcount leak in stub_probe()
Date:   Mon, 13 Jun 2022 12:10:16 +0200
Message-Id: <20220613094929.688447577@linuxfoundation.org>
In-Reply-To: <20220613094923.832156175@linuxfoundation.org>
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From: Hangyu Hua <hbh25y@gmail.com>

[ Upstream commit 9ec4cbf1cc55d126759051acfe328d489c5d6e60 ]

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()")
Reviewed-by: Shuah Khan <skhan@linuxfoundation.org>
Signed-off-by: Hangyu Hua <hbh25y@gmail.com>
Link: https://lore.kernel.org/r/20220412020257.9767-1-hbh25y@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 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 0081c1073b08..c64964c32cc9 100644
--- a/drivers/usb/usbip/stub_dev.c
+++ b/drivers/usb/usbip/stub_dev.c
@@ -427,7 +427,6 @@ static int stub_probe(struct usb_device *udev)
 			     (struct usb_dev_state *) 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);
@@ -442,6 +441,7 @@ 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;
-- 
2.35.1