linux-kernel - [PATCH] usb: misc: fix improper handling of refcount in uss720

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Message-Id: <20220406073349.22203-1-hbh25y@gmail.com>
Date:   Wed,  6 Apr 2022 15:33:49 +0800
From:   Hangyu Hua <hbh25y@...il.com>
To:     gregkh@...uxfoundation.org, mudongliangabcd@...il.com
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Hangyu Hua <hbh25y@...il.com>
Subject: [PATCH] usb: misc: fix improper handling of refcount in uss720_probe()

usb_put_dev shouldn't be called when uss720_probe succeeds because of
priv->usbdev. At the same time, priv->usbdev shouldn't be set to NULL
before destroy_priv in uss720_disconnect because usb_put_dev is in
destroy_priv.

Fixes: dcb4b8ad6a44 ("misc/uss720: fix memory leak in uss720_probe")
Signed-off-by: Hangyu Hua <hbh25y@...il.com>
---
 drivers/usb/misc/uss720.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/usb/misc/uss720.c b/drivers/usb/misc/uss720.c
index 748139d26263..e243c155511e 100644
--- a/drivers/usb/misc/uss720.c
+++ b/drivers/usb/misc/uss720.c
@@ -736,7 +736,6 @@ static int uss720_probe(struct usb_interface *intf,
 	parport_announce_port(pp);
 
 	usb_set_intfdata(intf, pp);
-	usb_put_dev(usbdev);
 	return 0;
 
 probe_abort:
@@ -754,13 +753,13 @@ static void uss720_disconnect(struct usb_interface *intf)
 	usb_set_intfdata(intf, NULL);
 	if (pp) {
 		priv = pp->private_data;
-		priv->usbdev = NULL;
 		priv->pp = NULL;
 		dev_dbg(&intf->dev, "parport_remove_port\n");
 		parport_remove_port(pp);
 		parport_put_port(pp);
 		kill_all_async_requests_priv(priv);
 		kref_put(&priv->ref_count, destroy_priv);
+		priv->usbdev = NULL;
 	}
 	dev_dbg(&intf->dev, "disconnect done\n");
 }
-- 
2.25.1