hso: fix for crash when unplugging the device

Changed the order in which things are freed. This fixes an oops when
unplugging the device while network traffic is ongoing.

Signed-off-by: Jan Dumon <j.dumon@option.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 11 insertions, 8 deletions

diff --git a/drivers/net/usb/hso.c b/drivers/net/usb/hso.c
index 28d1424a3110..779a0078fcde 100644
--- a/drivers/net/usb/hso.c
+++ b/drivers/net/usb/hso.c
@@ -5,6 +5,7 @@
  *  Copyright (C) 2008 Option International
  *                     Filip Aben <f.aben@option.com>
  *                     Denis Joseph Barrow <d.barow@option.com>
+ *                     Jan Dumon <j.dumon@option.com>
  *  Copyright (C) 2007 Andrew Bird (Sphere Systems Ltd)
  *                      <ajb@spheresystems.co.uk>
  *  Copyright (C) 2008 Greg Kroah-Hartman <gregkh@suse.de>
@@ -2417,20 +2418,22 @@ static void hso_free_net_device(struct hso_device *hso_dev)
         if (!hso_net)
                 return;
 
+        remove_net_device(hso_net->parent);
+
+        if (hso_net->net) {
+                unregister_netdev(hso_net->net);
+                free_netdev(hso_net->net);
+        }
+
         /* start freeing */
         for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
                 usb_free_urb(hso_net->mux_bulk_rx_urb_pool[i]);
                 kfree(hso_net->mux_bulk_rx_buf_pool[i]);
+                hso_net->mux_bulk_rx_buf_pool[i] = NULL;
         }
         usb_free_urb(hso_net->mux_bulk_tx_urb);
         kfree(hso_net->mux_bulk_tx_buf);
-
-        remove_net_device(hso_net->parent);
-
-        if (hso_net->net) {
-                unregister_netdev(hso_net->net);
-                free_netdev(hso_net->net);
-        }
+        hso_net->mux_bulk_tx_buf = NULL;
 
         kfree(hso_dev);
 }
@@ -2620,12 +2623,12 @@ static void hso_free_tiomget(struct hso_serial *serial)
 {
         struct hso_tiocmget *tiocmget = serial->tiocmget;
         if (tiocmget) {
-                kfree(tiocmget);
                 if (tiocmget->urb) {
                         usb_free_urb(tiocmget->urb);
                         tiocmget->urb = NULL;
                 }
                 serial->tiocmget = NULL;
+                kfree(tiocmget);
 
         }
 }