orinoco_usb: potential null dereference

Smatch complains that "upriv->read_urb" gets dereferenced before
checking for NULL.  It turns out that it's possible for
"upriv->read_urb" to be NULL so I added checks around the dereferences.

Also I remove an "if (upriv->bap_buf != NULL)" check because
"kfree(NULL) is OK.

Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/orinoco/orinoco_usb.c b/drivers/net/wireless/orinoco/orinoco_usb.c
index 020da76..b786400 100644 (file)
--- a/drivers/net/wireless/orinoco/orinoco_usb.c
+++ b/drivers/net/wireless/orinoco/orinoco_usb.c
@@ -1502,16 +1502,16 @@ static inline void ezusb_delete(struct ezusb_priv *upriv)
            ezusb_ctx_complete(list_entry(item,
                                          struct request_context, list));
 
-       if (upriv->read_urb->status == -EINPROGRESS)
+       if (upriv->read_urb && upriv->read_urb->status == -EINPROGRESS)
                printk(KERN_ERR PFX "Some URB in progress\n");
 
        mutex_unlock(&upriv->mtx);
 
-       kfree(upriv->read_urb->transfer_buffer);
-       if (upriv->bap_buf != NULL)
-               kfree(upriv->bap_buf);
-       if (upriv->read_urb != NULL)
+       if (upriv->read_urb) {
+               kfree(upriv->read_urb->transfer_buffer);
                usb_free_urb(upriv->read_urb);
+       }
+       kfree(upriv->bap_buf);
        if (upriv->dev) {
                struct orinoco_private *priv = ndev_priv(upriv->dev);
                orinoco_if_del(priv);