usb: usb_wwan: resume/suspend can be called after port is gone

We cannot unconditionally access any usb-serial port specific
data from the interface driver.  Both supending and resuming
may happen after the port has been removed and portdata is
freed.

Treat ports with no portdata as closed ports to avoid a NULL
pointer dereference on resume.  No need to kill URBs for
removed ports on suspend, avoiding the same NULL pointer
reference there.

Signed-off-by: Bjørn Mork <bjorn@mork.no>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/usb/serial/usb_wwan.c b/drivers/usb/serial/usb_wwan.c
index 7d0811335b9a..6855d5ed0331 100644
--- a/drivers/usb/serial/usb_wwan.c
+++ b/drivers/usb/serial/usb_wwan.c
@@ -602,6 +602,8 @@ static void stop_read_write_urbs(struct usb_serial *serial)
         for (i = 0; i < serial->num_ports; ++i) {
                 port = serial->port[i];
                 portdata = usb_get_serial_port_data(port);
+                if (!portdata)
+                        continue;
                 for (j = 0; j < N_IN_URB; j++)
                         usb_kill_urb(portdata->in_urbs[j]);
                 for (j = 0; j < N_OUT_URB; j++)
@@ -700,7 +702,7 @@ int usb_wwan_resume(struct usb_serial *serial)
 
                 /* skip closed ports */
                 spin_lock_irq(&intfdata->susp_lock);
-                if (!portdata->opened) {
+                if (!portdata || !portdata->opened) {
                         spin_unlock_irq(&intfdata->susp_lock);
                         continue;
                 }