staging: vt6656: fix potential NULL pointer dereference

vnt_free_tx_bufs() relies on priv->tx_context elements to be NULL if
they are not initialized (as vnt_free_rx_bufs() does). Add a check to
these elements in order to avoid NULL pointer dereference.

Signed-off-by: Quentin Deslandes <quentin.deslandes@itdev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/vt6656/main_usb.c b/drivers/staging/vt6656/main_usb.c
index ccafcc2c87ac980da5f70e52cfa89ad41a0cdf45..bfe952fe27bf396d8a360ad056160c7d2b9f797f 100644 (file)
--- a/drivers/staging/vt6656/main_usb.c
+++ b/drivers/staging/vt6656/main_usb.c
@@ -363,6 +363,9 @@ static void vnt_free_tx_bufs(struct vnt_private *priv)
 
        for (ii = 0; ii < priv->num_tx_context; ii++) {
                tx_context = priv->tx_context[ii];
+               if (!tx_context)
+                       continue;
+
                /* deallocate URBs */
                if (tx_context->urb) {
                        usb_kill_urb(tx_context->urb);