4.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Johan Hovold johan@kernel.org
commit 19a565d9af6e0d828bd0d521d3bafd5017f4ce52 upstream.
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: 1da177e4c3f4 ("Linux-2.6.12-rc2") Reviewed-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Johan Hovold johan@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/usb/serial/garmin_gps.c | 16 +++++++++++++--- 1 file changed, 13 insertions(+), 3 deletions(-)
--- a/drivers/usb/serial/garmin_gps.c +++ b/drivers/usb/serial/garmin_gps.c @@ -138,6 +138,7 @@ struct garmin_data { __u8 privpkt[4*6]; spinlock_t lock; struct list_head pktlist; + struct usb_anchor write_urbs; };
@@ -906,7 +907,7 @@ static int garmin_init_session(struct us sizeof(GARMIN_START_SESSION_REQ), 0);
if (status < 0) - break; + goto err_kill_urbs; }
if (status > 0) @@ -914,6 +915,12 @@ static int garmin_init_session(struct us }
return status; + +err_kill_urbs: + usb_kill_anchored_urbs(&garmin_data_p->write_urbs); + usb_kill_urb(port->interrupt_in_urb); + + return status; }
@@ -931,7 +938,6 @@ static int garmin_open(struct tty_struct 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) @@ -954,7 +960,7 @@ static void garmin_close(struct usb_seri
/* 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) @@ -1038,12 +1044,14 @@ static int garmin_write_bulk(struct usb_ }
/* 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); }
@@ -1402,6 +1410,7 @@ static int garmin_port_probe(struct usb_ 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); @@ -1414,6 +1423,7 @@ static int garmin_port_remove(struct usb { 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);