wifi: rtw88: fix device leak on probe failure

commit bbb15e71156cd9f5e1869eee7207a06ea8e96c39 upstream.

Driver core holds a reference to the USB interface and its parent USB
device while the interface is bound to a driver and there is no need to
take additional references unless the structures are needed after
disconnect.

This driver takes a reference to the USB device during probe but does
not to release it on all probe errors (e.g. when descriptor parsing
fails).

Drop the redundant device reference to fix the leak, reduce cargo
culting, make it easier to spot drivers where an extra reference is
needed, and reduce the risk of further memory leaks.

Fixes: a82dfd33d123 ("wifi: rtw88: Add common USB chip support")
Reported-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: https://lore.kernel.org/netdev/2026022319-turbofan-darkened-206d@gregkh/
Cc: stable@vger.kernel.org	# 6.2
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Link: https://patch.msgid.link/20260306085144.12064-19-johan@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/wireless/realtek/rtw88/usb.c b/drivers/net/wireless/realtek/rtw88/usb.c
index 3b5126ffc81a1c4b869c3c1fc3314a1fd591b709..6e841a11c752bbccd82d828762ab8f922a6bbe11 100644 (file)
--- a/drivers/net/wireless/realtek/rtw88/usb.c
+++ b/drivers/net/wireless/realtek/rtw88/usb.c
@@ -1040,7 +1040,7 @@ static int rtw_usb_intf_init(struct rtw_dev *rtwdev,
                             struct usb_interface *intf)
 {
        struct rtw_usb *rtwusb = rtw_get_usb_priv(rtwdev);
-       struct usb_device *udev = usb_get_dev(interface_to_usbdev(intf));
+       struct usb_device *udev = interface_to_usbdev(intf);
        int ret;
 
        rtwusb->udev = udev;
@@ -1066,7 +1066,6 @@ static void rtw_usb_intf_deinit(struct rtw_dev *rtwdev,
 {
        struct rtw_usb *rtwusb = rtw_get_usb_priv(rtwdev);
 
-       usb_put_dev(rtwusb->udev);
        kfree(rtwusb->usb_data);
        usb_set_intfdata(intf, NULL);
 }