6pack: Fix use after free in sixpack_close().
Need to do the unregister_device() after all references to the driver
private have been done.
Also we need to use del_timer_sync() for the timers so that we don't
have any asynchronous references after the unregister.
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/hamradio/6pack.c b/drivers/net/hamradio/6pack.c
index 7c4a415..9f0b1c3 100644
--- a/drivers/net/hamradio/6pack.c
+++ b/drivers/net/hamradio/6pack.c
@@ -683,14 +683,14 @@
if (!atomic_dec_and_test(&sp->refcnt))
down(&sp->dead_sem);
- unregister_netdev(sp->dev);
-
- del_timer(&sp->tx_t);
- del_timer(&sp->resync_t);
+ del_timer_sync(&sp->tx_t);
+ del_timer_sync(&sp->resync_t);
/* Free all 6pack frame buffers. */
kfree(sp->rbuff);
kfree(sp->xbuff);
+
+ unregister_netdev(sp->dev);
}
/* Perform I/O control on an active 6pack channel. */