Commit 508f940f authored by Johan Hovold's avatar Johan Hovold Committed by Greg Kroah-Hartman

USB: f81232: fix use-after-free in TIOCMIWAIT

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.

Cc: stable <stable@vger.kernel.org>
Signed-off-by: default avatarJohan Hovold <jhovold@gmail.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 356050d8
......@@ -47,7 +47,6 @@ MODULE_DEVICE_TABLE(usb, id_table);
struct f81232_private {
spinlock_t lock;
wait_queue_head_t delta_msr_wait;
u8 line_control;
u8 line_status;
};
......@@ -111,7 +110,7 @@ static void f81232_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;
......@@ -256,11 +255,14 @@ 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);
......@@ -322,7 +324,6 @@ static int f81232_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);
......
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