USB: pl2303: fix use-after-free in TIOCMIWAIT

commit 40509ca982c00c4b70fc00be887509feca0bff15 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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/serial/pl2303.c b/drivers/usb/serial/pl2303.c
index 600241901361e62458d0d002e22261e1e5c0bc5f..bb056a14a90f208a190ce0abd9a575a18fbe8e81 100644 (file)
--- a/drivers/usb/serial/pl2303.c
+++ b/drivers/usb/serial/pl2303.c
@@ -139,7 +139,6 @@ struct pl2303_serial_private {
 
 struct pl2303_private {
        spinlock_t lock;
-       wait_queue_head_t delta_msr_wait;
        u8 line_control;
        u8 line_status;
 };
@@ -233,7 +232,6 @@ static int pl2303_port_probe(struct usb_serial_port *port)
                return -ENOMEM;
 
        spin_lock_init(&priv->lock);
-       init_waitqueue_head(&priv->delta_msr_wait);
 
        usb_set_serial_port_data(port, priv);
 
@@ -607,11 +605,14 @@ static int wait_modem_info(struct usb_serial_port *port, unsigned int arg)
        spin_unlock_irqrestore(&priv->lock, flags);
 
        while (1) {
-               interruptible_sleep_on(&priv->delta_msr_wait);
+               interruptible_sleep_on(&port->delta_msr_wait);
                /* see if a signal did it */
                if (signal_pending(current))
                        return -ERESTARTSYS;
 
+               if (port->serial->disconnected)
+                       return -EIO;
+
                spin_lock_irqsave(&priv->lock, flags);
                status = priv->line_status;
                spin_unlock_irqrestore(&priv->lock, flags);
@@ -719,7 +720,7 @@ static void pl2303_update_line_status(struct usb_serial_port *port,
        spin_unlock_irqrestore(&priv->lock, flags);
        if (priv->line_status & UART_BREAK_ERROR)
                usb_serial_handle_break(port);
-       wake_up_interruptible(&priv->delta_msr_wait);
+       wake_up_interruptible(&port->delta_msr_wait);
 
        tty = tty_port_tty_get(&port->port);
        if (!tty)
@@ -784,7 +785,7 @@ static void pl2303_process_read_urb(struct urb *urb)
        line_status = priv->line_status;
        priv->line_status &= ~UART_STATE_TRANSIENT_MASK;
        spin_unlock_irqrestore(&priv->lock, flags);
-       wake_up_interruptible(&priv->delta_msr_wait);
+       wake_up_interruptible(&port->delta_msr_wait);
 
        if (!urb->actual_length)
                return;