[PATCH 3.10 31/77] USB: usb_wwan: fix potential NULL-deref at resume

Greg Kroah-Hartman
2014-06-28T19:11:39Z

From: Johan Hovold <jhovold@gmail.com>

commit 9096f1fbba916c2e052651e9de82fcfb98d4bea7 upstream.

The interrupt urb was submitted unconditionally at resume, something
which could lead to a NULL-pointer dereference in the urb completion
handler as resume may be called after the port and port data is gone.

Fix this by making sure the interrupt urb is only submitted and active
when the port is open.

Fixes: 383cedc3bb43 ("USB: serial: full autosuspend support for the
option driver")

Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/usb/serial/usb_wwan.c | 43 ++++++++++++++++++------------------------
1 file changed, 19 insertions(+), 24 deletions(-)

--- a/drivers/usb/serial/usb_wwan.c
+++ b/drivers/usb/serial/usb_wwan.c
@@ -388,6 +388,14 @@ int usb_wwan_open(struct tty_struct *tty
portdata = usb_get_serial_port_data(port);
intfdata = serial->private;

+ if (port->interrupt_in_urb) {
+ err = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
+ if (err) {
+ dev_dbg(&port->dev, "%s: submit int urb failed: %d\n",
+ __func__, err);
+ }
+ }
+
/* Start reading from the IN endpoint */
for (i = 0; i < N_IN_URB; i++) {
urb = portdata->in_urbs[i];
@@ -454,6 +462,7 @@ void usb_wwan_close(struct usb_serial_po
usb_kill_urb(portdata->in_urbs[i]);
for (i = 0; i < N_OUT_URB; i++)
usb_kill_urb(portdata->out_urbs[i]);
+ usb_kill_urb(port->interrupt_in_urb);

/* balancing - important as an error cannot be handled*/
usb_autopm_get_interface_no_resume(serial->interface);
@@ -491,7 +500,6 @@ int usb_wwan_port_probe(struct usb_seria
struct usb_wwan_port_private *portdata;
struct urb *urb;
u8 *buffer;
- int err;
int i;

if (!port->bulk_in_size || !port->bulk_out_size)
@@ -531,13 +539,6 @@ int usb_wwan_port_probe(struct usb_seria

usb_set_serial_port_data(port, portdata);

- if (port->interrupt_in_urb) {
- err = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
- if (err)
- dev_dbg(&port->dev, "%s: submit irq_in urb failed %d\n",
- __func__, err);
- }
-
return 0;

bail_out_error2:
@@ -655,22 +656,6 @@ int usb_wwan_resume(struct usb_serial *s
struct urb *urb;
int err = 0;

- /* get the interrupt URBs resubmitted unconditionally */
- for (i = 0; i < serial->num_ports; i++) {
- port = serial->port[i];
- if (!port->interrupt_in_urb) {
- dev_dbg(&port->dev, "%s: No interrupt URB for port\n", __func__);
- continue;
- }
- err = usb_submit_urb(port->interrupt_in_urb, GFP_NOIO);
- dev_dbg(&port->dev, "Submitted interrupt URB for port (result %d)\n", err);
- if (err < 0) {
- dev_err(&port->dev, "%s: Error %d for interrupt URB\n",
- __func__, err);
- goto err_out;
- }
- }
-
spin_lock_irq(&intfdata->susp_lock);
for (i = 0; i < serial->num_ports; i++) {
/* walk all ports */
@@ -681,6 +666,16 @@ int usb_wwan_resume(struct usb_serial *s
if (!portdata || !portdata->opened)
continue;

+ if (port->interrupt_in_urb) {
+ err = usb_submit_urb(port->interrupt_in_urb,
+ GFP_ATOMIC);
+ if (err) {
+ dev_err(&port->dev,
+ "%s: submit int urb failed: %d\n",
+ __func__, err);
+ }
+ }
+
for (j = 0; j < N_IN_URB; j++) {
urb = portdata->in_urbs[j];
err = usb_submit_urb(urb, GFP_ATOMIC);