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 cf0769ad39cdba93c24316190e54db8071f2ef1d..b2e5bcae7fbe0e5d0b9a081e076f115936f8e616 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 77207f936871e510afceaee29926eb610450a16a..93f303ec17e21f362a96f87d5e75a3e3b65c6621 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)
@@ -882,10 +889,11 @@ 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 */