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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, Bernd Krumboeck <b.krumboeck@gmail.com>,
        Wolfgang Grandegger <wg@grandegger.com>,
        Johan Hovold <johan@kernel.org>,
        Marc Kleine-Budde <mkl@pengutronix.de>
Subject: [PATCH 4.9 22/65] can: usb_8dev: fix use-after-free on disconnect
Date:   Mon, 11 Nov 2019 19:28:22 +0100
Message-Id: <20191111181345.056368548@linuxfoundation.org>
In-Reply-To: <20191111181331.917659011@linuxfoundation.org>
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From: Johan Hovold <johan@kernel.org>

commit 3759739426186a924675651b388d1c3963c5710e upstream.

The driver was accessing its driver data after having freed it.

Fixes: 0024d8ad1639 ("can: usb_8dev: Add support for USB2CAN interface from 8 devices")
Cc: stable <stable@vger.kernel.org>     # 3.9
Cc: Bernd Krumboeck <b.krumboeck@gmail.com>
Cc: Wolfgang Grandegger <wg@grandegger.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/net/can/usb/usb_8dev.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/drivers/net/can/usb/usb_8dev.c
+++ b/drivers/net/can/usb/usb_8dev.c
@@ -1007,9 +1007,8 @@ static void usb_8dev_disconnect(struct u
 		netdev_info(priv->netdev, "device disconnected\n");
 
 		unregister_netdev(priv->netdev);
-		free_candev(priv->netdev);
-
 		unlink_all_urbs(priv);
+		free_candev(priv->netdev);
 	}
 
 }