can, slip: Protect tty->disc_data in write_wakeup and close with RCU

[ Upstream commit 0ace17d56824165c7f4c68785d6b58971db954dd ]

write_wakeup can happen in parallel with close/hangup where tty->disc_data
is set to NULL and the netdevice is freed thus also freeing
disc_data. write_wakeup accesses disc_data so we must prevent close from
freeing the netdev while write_wakeup has a non-NULL view of
tty->disc_data.

We also need to make sure that accesses to disc_data are atomic. Which can
all be done with RCU.

This problem was found by Syzkaller on SLCAN, but the same issue is
reproducible with the SLIP line discipline using an LTP test based on the
Syzkaller reproducer.

A fix which didn't use RCU was posted by Hillf Danton.

Fixes: 661f7fda21b1 ("slip: Fix deadlock in write_wakeup")
Fixes: a8e83b17536a ("slcan: Port write_wakeup deadlock fix from slip")
Reported-by: syzbot+017e491ae13c0068598a@syzkaller.appspotmail.com
Signed-off-by: Richard Palethorpe <rpalethorpe@suse.com>
Cc: Wolfgang Grandegger <wg@grandegger.com>
Cc: Marc Kleine-Budde <mkl@pengutronix.de>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Tyler Hall <tylerwhall@gmail.com>
Cc: linux-can@vger.kernel.org
Cc: netdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: syzkaller@googlegroups.com
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/can/slcan.c b/drivers/net/can/slcan.c
index a42737b4ac79f20639300296b364d7404d18b1a3..35564a9561b7828be777e5b288afb77f88e95ce8 100644 (file)
--- a/drivers/net/can/slcan.c
+++ b/drivers/net/can/slcan.c
@@ -343,9 +343,16 @@ static void slcan_transmit(struct work_struct *work)
  */
 static void slcan_write_wakeup(struct tty_struct *tty)
 {
-       struct slcan *sl = tty->disc_data;
+       struct slcan *sl;
+
+       rcu_read_lock();
+       sl = rcu_dereference(tty->disc_data);
+       if (!sl)
+               goto out;
 
        schedule_work(&sl->tx_work);
+out:
+       rcu_read_unlock();
 }
 
 /* Send a can_frame to a TTY queue. */
@@ -640,10 +647,11 @@ static void slcan_close(struct tty_struct *tty)
                return;
 
        spin_lock_bh(&sl->lock);
-       tty->disc_data = NULL;
+       rcu_assign_pointer(tty->disc_data, NULL);
        sl->tty = NULL;
        spin_unlock_bh(&sl->lock);
 
+       synchronize_rcu();
        flush_work(&sl->tx_work);
 
        /* Flush network side */

diff --git a/drivers/net/slip/slip.c b/drivers/net/slip/slip.c
index d6dc00b4ba5520fdb1175cca94b197dcc7d3feb4..b07f367abd9157ee2416af634d8853cb6af9f7d7 100644 (file)
--- a/drivers/net/slip/slip.c
+++ b/drivers/net/slip/slip.c
@@ -452,9 +452,16 @@ static void slip_transmit(struct work_struct *work)
  */
 static void slip_write_wakeup(struct tty_struct *tty)
 {
-       struct slip *sl = tty->disc_data;
+       struct slip *sl;
+
+       rcu_read_lock();
+       sl = rcu_dereference(tty->disc_data);
+       if (!sl)
+               goto out;
 
        schedule_work(&sl->tx_work);
+out:
+       rcu_read_unlock();
 }
 
 static void sl_tx_timeout(struct net_device *dev)
@@ -886,10 +893,11 @@ static void slip_close(struct tty_struct *tty)
                return;
 
        spin_lock_bh(&sl->lock);
-       tty->disc_data = NULL;
+       rcu_assign_pointer(tty->disc_data, NULL);
        sl->tty = NULL;
        spin_unlock_bh(&sl->lock);
 
+       synchronize_rcu();
        flush_work(&sl->tx_work);
 
        /* VSV = very important to remove timers */