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Subject[PATCH 4.9 14/66] usb: misc: fix improper handling of refcount in uss720_probe()
Date
From: Hangyu Hua <hbh25y@gmail.com>

commit 0a96fa640dc928da9eaa46a22c46521b037b78ad upstream.

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.

Fix this by moving priv->usbdev = NULL after usb_put_dev.

Fixes: dcb4b8ad6a44 ("misc/uss720: fix memory leak in uss720_probe")
Cc: stable <stable@kernel.org>
Reviewed-by: Dongliang Mu <mudongliangabcd@gmail.com>
Signed-off-by: Hangyu Hua <hbh25y@gmail.com>
Link: https://lore.kernel.org/r/20220407024001.11761-1-hbh25y@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/usb/misc/uss720.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)

--- a/drivers/usb/misc/uss720.c
+++ b/drivers/usb/misc/uss720.c
@@ -87,6 +87,7 @@ static void destroy_priv(struct kref *kr

dev_dbg(&priv->usbdev->dev, "destroying priv datastructure\n");
usb_put_dev(priv->usbdev);
+ priv->usbdev = NULL;
kfree(priv);
}

@@ -750,7 +751,6 @@ static int uss720_probe(struct usb_inter
parport_announce_port(pp);

usb_set_intfdata(intf, pp);
- usb_put_dev(usbdev);
return 0;

probe_abort:
@@ -770,7 +770,6 @@ static void uss720_disconnect(struct usb
if (pp) {
priv = pp->private_data;
usbdev = priv->usbdev;
- priv->usbdev = NULL;
priv->pp = NULL;
dev_dbg(&intf->dev, "parport_remove_port\n");
parport_remove_port(pp);

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