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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, Johan Hovold <johan@kernel.org>,
        "David S. Miller" <davem@davemloft.net>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.19 49/72] net: cdc-phonet: fix data-interface release on probe failure
Date:   Mon, 29 Mar 2021 09:58:25 +0200
Message-Id: <20210329075611.900506511@linuxfoundation.org>
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From: Johan Hovold <johan@kernel.org>

[ Upstream commit c79a707072fe3fea0e3c92edee6ca85c1e53c29f ]

Set the disconnected flag before releasing the data interface in case
netdev registration fails to avoid having the disconnect callback try to
deregister the never registered netdev (and trigger a WARN_ON()).

Fixes: 87cf65601e17 ("USB host CDC Phonet network interface driver")
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/usb/cdc-phonet.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/usb/cdc-phonet.c b/drivers/net/usb/cdc-phonet.c
index 78b16eb9e58c..f448e484a341 100644
--- a/drivers/net/usb/cdc-phonet.c
+++ b/drivers/net/usb/cdc-phonet.c
@@ -400,6 +400,8 @@ static int usbpn_probe(struct usb_interface *intf, const struct usb_device_id *i
 
 	err = register_netdev(dev);
 	if (err) {
+		/* Set disconnected flag so that disconnect() returns early. */
+		pnd->disconnected = 1;
 		usb_driver_release_interface(&usbpn_driver, data_intf);
 		goto out;
 	}
-- 
2.30.1