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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>
This commit is contained in:
David Miller 2015-12-17 16:05:32 -05:00 committed by David S. Miller
parent 6e3cd5fa65
commit acf673a318
1 changed files with 4 additions and 4 deletions
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8
drivers/net/hamradio/6pack.c
View File

@ -683,14 +683,14 @@ static void sixpack_close(struct tty_struct *tty)
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. */