USB: oti6858: fix use-after-free in TIOCMIWAIT
commit 8edfdab37157d2683e51b8be5d3d5697f66a9f7b upstream.
Use the port wait queue and make sure to check the serial disconnected
flag before accessing private port data after waking up.
This is is needed as the private port data (including the wait queue
itself) can be gone when waking up after a disconnect.
Signed-off-by: Johan Hovold <jhovold@gmail.com>
[bwh: Backported to 3.2: adjust context, indentation]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Cc: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/usb/serial/oti6858.c b/drivers/usb/serial/oti6858.c
index 5fdc33c..bddc9f1 100644
--- a/drivers/usb/serial/oti6858.c
+++ b/drivers/usb/serial/oti6858.c
@@ -198,7 +198,6 @@
u8 setup_done;
struct delayed_work delayed_setup_work;
- wait_queue_head_t intr_wait;
struct usb_serial_port *port; /* USB port with which associated */
};
@@ -356,7 +355,6 @@
break;
spin_lock_init(&priv->lock);
- init_waitqueue_head(&priv->intr_wait);
/* INIT_WORK(&priv->setup_work, setup_line, serial->port[i]); */
/* INIT_WORK(&priv->write_work, send_data, serial->port[i]); */
priv->port = port;
@@ -703,11 +701,15 @@
spin_unlock_irqrestore(&priv->lock, flags);
while (1) {
- wait_event_interruptible(priv->intr_wait,
+ wait_event_interruptible(port->delta_msr_wait,
+ port->serial->disconnected ||
priv->status.pin_state != prev);
if (signal_pending(current))
return -ERESTARTSYS;
+ if (port->serial->disconnected)
+ return -EIO;
+
spin_lock_irqsave(&priv->lock, flags);
status = priv->status.pin_state & PIN_MASK;
spin_unlock_irqrestore(&priv->lock, flags);
@@ -819,7 +821,7 @@
if (!priv->transient) {
if (xs->pin_state != priv->status.pin_state)
- wake_up_interruptible(&priv->intr_wait);
+ wake_up_interruptible(&port->delta_msr_wait);
memcpy(&priv->status, xs, OTI6858_CTRL_PKT_SIZE);
}