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USB: io_ti, stop dereferencing potential NULL

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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 <jslaby@suse.cz>
Cc: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jiri Slaby 2013-04-04 22:41:01 +02:00 committed by Greg Kroah-Hartman
parent 64dc9e2e73
commit ae3759c257
1 changed files with 4 additions and 5 deletions
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9
drivers/usb/serial/io_ti.c
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@ -206,7 +206,7 @@ static int restart_read(struct edgeport_port *edge_port);
static void edge_set_termios(struct tty_struct *tty, static void edge_set_termios(struct tty_struct *tty,
struct usb_serial_port *port, struct ktermios *old_termios); 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 */ /* sysfs attributes */
static int edge_create_sysfs_attrs(struct usb_serial_port *port); 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 */ /* send any buffered data */
tty = tty_port_tty_get(&port->port); tty = tty_port_tty_get(&port->port);
edge_send(tty); edge_send(port, tty);
tty_kref_put(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, count = kfifo_in_locked(&edge_port->write_fifo, data, count,
&edge_port->ep_lock); &edge_port->ep_lock);
edge_send(tty); edge_send(port, tty);
return count; 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; int count, result;
struct edgeport_port *edge_port = usb_get_serial_port_data(port); struct edgeport_port *edge_port = usb_get_serial_port_data(port);
unsigned long flags; unsigned long flags;