From: Jiri Slaby Date: Thu, 4 Apr 2013 20:41:01 +0000 (+0200) Subject: USB: io_ti, stop dereferencing potential NULL X-Git-Tag: firefly_0821_release~3680^2~672^2~62 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=ae3759c2573031f1306496c6f9f32f20e86f03aa;p=firefly-linux-kernel-4.4.55.git USB: io_ti, stop dereferencing potential NULL tty_port_tty_get might return a tty which is NULL. But it is dereferenced unconditionally in edge_send. Stop dereferencing that by sending usb_serial_port pointer around. Signed-off-by: Jiri Slaby Cc: Johan Hovold Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/usb/serial/io_ti.c b/drivers/usb/serial/io_ti.c index 0ccc4225d593..f2a1601775b1 100644 --- a/drivers/usb/serial/io_ti.c +++ b/drivers/usb/serial/io_ti.c @@ -206,7 +206,7 @@ static int restart_read(struct edgeport_port *edge_port); static void edge_set_termios(struct tty_struct *tty, struct usb_serial_port *port, struct ktermios *old_termios); -static void edge_send(struct tty_struct *tty); +static void edge_send(struct usb_serial_port *port, struct tty_struct *tty); /* sysfs attributes */ static int edge_create_sysfs_attrs(struct usb_serial_port *port); @@ -1712,7 +1712,7 @@ static void edge_bulk_out_callback(struct urb *urb) /* send any buffered data */ tty = tty_port_tty_get(&port->port); - edge_send(tty); + edge_send(port, tty); tty_kref_put(tty); } @@ -1940,14 +1940,13 @@ static int edge_write(struct tty_struct *tty, struct usb_serial_port *port, count = kfifo_in_locked(&edge_port->write_fifo, data, count, &edge_port->ep_lock); - edge_send(tty); + edge_send(port, tty); return count; } -static void edge_send(struct tty_struct *tty) +static void edge_send(struct usb_serial_port *port, struct tty_struct *tty) { - struct usb_serial_port *port = tty->driver_data; int count, result; struct edgeport_port *edge_port = usb_get_serial_port_data(port); unsigned long flags;