linux-kernel - [PATCH 3.16 117/136] can: usb_8dev: fix use-after-free on disconnect

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Date:   Tue, 17 Dec 2019 00:47:31 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Bernd Krumboeck" <b.krumboeck@...il.com>,
        "Marc Kleine-Budde" <mkl@...gutronix.de>,
        "Wolfgang Grandegger" <wg@...ndegger.com>,
        "Johan Hovold" <johan@...nel.org>
Subject: [PATCH 3.16 117/136] can: usb_8dev: fix use-after-free on disconnect

3.16.80-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Johan Hovold <johan@...nel.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: Bernd Krumboeck <b.krumboeck@...il.com>
Cc: Wolfgang Grandegger <wg@...ndegger.com>
Signed-off-by: Johan Hovold <johan@...nel.org>
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 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
@@ -1013,9 +1013,8 @@ 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);
 	}
 
 }