6pack: fix free memory scribbles

commit acf673a3187edf72068ee2f92f4dc47d66baed47 fixed a user triggerable free
memory scribble but in doing so replaced it with a different one that allows
the user to control the data and scribble even more.

sixpack_close is called by the tty layer in tty context. The tty context is
protected by sp_get() and sp_put(). However network layer activity via
sp_xmit() is not protected this way. We must therefore stop the queue
otherwise the user gets to dump a buffer mostly of their choice into freed
kernel pages.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/net/hamradio/6pack.c b/drivers/net/hamradio/6pack.c
index 9f0b1c342b77..5a1e98547031 100644
--- a/drivers/net/hamradio/6pack.c
+++ b/drivers/net/hamradio/6pack.c
@@ -683,6 +683,12 @@ static void sixpack_close(struct tty_struct *tty)
         if (!atomic_dec_and_test(&sp->refcnt))
                 down(&sp->dead_sem);
 
+        /* We must stop the queue to avoid potentially scribbling
+         * on the free buffers. The sp->dead_sem is not sufficient
+         * to protect us from sp->xbuff access.
+         */
+        netif_stop_queue(sp->dev);
+
         del_timer_sync(&sp->tx_t);
         del_timer_sync(&sp->resync_t);