staging: ozwpan: Fixes crash due to invalid port aceess.

This patch fixes kernel crash issue, when we receive URB request
after de-enumerating device.

Signed-off-by: Rupesh Gujare <rupesh.gujare@atmel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/ozwpan/ozhcd.c b/drivers/staging/ozwpan/ozhcd.c
index ed63868..d313a63 100644 (file)
--- a/drivers/staging/ozwpan/ozhcd.c
+++ b/drivers/staging/ozwpan/ozhcd.c
@@ -480,10 +480,14 @@ static int oz_enqueue_ep_urb(struct oz_port *port, u8 ep_addr, int in_dir,
                oz_free_urb_link(urbl);
                return 0;
        }
-       if (in_dir)
+       if (in_dir && port->in_ep[ep_addr])
                ep = port->in_ep[ep_addr];
-       else
+       else if (!in_dir && port->out_ep[ep_addr])
                ep = port->out_ep[ep_addr];
+       else {
+               err = -ENOMEM;
+               goto out;
+       }
 
        /*For interrupt endpoint check for buffered data
        * & complete urb
@@ -505,6 +509,7 @@ static int oz_enqueue_ep_urb(struct oz_port *port, u8 ep_addr, int in_dir,
        } else {
                err = -EPIPE;
        }
+out:
        spin_unlock_bh(&port->ozhcd->hcd_lock);
        if (err)
                oz_free_urb_link(urbl);