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USB: serial: garmin_gps: fix I/O after failed probe and remove 

Make sure to stop any submitted interrupt and bulk-out URBs before
returning after failed probe and when the port is being unbound to avoid
later NULL-pointer dereferences in the completion callbacks.

Also fix up the related and broken I/O cancellation on failed open and
on close. (Note that port->write_urb was never submitted.)

Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Cc: stable <stable@vger.kernel.org>	# 51a2f077 ("USB: introduce usb_anchor")
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
This commit is contained in:
Johan Hovold 2017-10-11 14:02:57 +02:00
parent 29d1536138
commit 19a565d9af
1 changed files with 13 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
drivers/usb/serial/garmin_gps.c
View File

@ -138,6 +138,7 @@ struct garmin_data {
__u8 privpkt[4*6];
spinlock_t lock;
struct list_head pktlist;
struct usb_anchor write_urbs;
};
@ -905,13 +906,19 @@ static int garmin_init_session(struct usb_serial_port *port)
sizeof(GARMIN_START_SESSION_REQ), 0);
if (status < 0)
break;
goto err_kill_urbs;
}
if (status > 0)
status = 0;
}
return status;
err_kill_urbs:
usb_kill_anchored_urbs(&garmin_data_p->write_urbs);
usb_kill_urb(port->interrupt_in_urb);
return status;
}
@ -930,7 +937,6 @@ static int garmin_open(struct tty_struct *tty, struct usb_serial_port *port)
spin_unlock_irqrestore(&garmin_data_p->lock, flags);
/* shutdown any bulk reads that might be going on */
usb_kill_urb(port->write_urb);
usb_kill_urb(port->read_urb);
if (garmin_data_p->state == STATE_RESET)
@ -953,7 +959,7 @@ static void garmin_close(struct usb_serial_port *port)
/* shutdown our urbs */
usb_kill_urb(port->read_urb);
usb_kill_urb(port->write_urb);
usb_kill_anchored_urbs(&garmin_data_p->write_urbs);
/* keep reset state so we know that we must start a new session */
if (garmin_data_p->state != STATE_RESET)
@ -1037,12 +1043,14 @@ static int garmin_write_bulk(struct usb_serial_port *port,
}
/* send it down the pipe */
usb_anchor_urb(urb, &garmin_data_p->write_urbs);
status = usb_submit_urb(urb, GFP_ATOMIC);
if (status) {
dev_err(&port->dev,
"%s - usb_submit_urb(write bulk) failed with status = %d\n",
__func__, status);
count = status;
usb_unanchor_urb(urb);
kfree(buffer);
}
@ -1399,6 +1407,7 @@ static int garmin_port_probe(struct usb_serial_port *port)
garmin_data_p->state = 0;
garmin_data_p->flags = 0;
garmin_data_p->count = 0;
init_usb_anchor(&garmin_data_p->write_urbs);
usb_set_serial_port_data(port, garmin_data_p);
status = garmin_init_session(port);
@ -1411,6 +1420,7 @@ static int garmin_port_remove(struct usb_serial_port *port)
{
struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
usb_kill_anchored_urbs(&garmin_data_p->write_urbs);
usb_kill_urb(port->interrupt_in_urb);
del_timer_sync(&garmin_data_p->timer);
kfree(garmin_data_p);