can: kvaser_usb: Don't dereference skb after a netif_rx()

We should not touch the packet after a netif_rx: it might
get freed behind our back.

Suggested-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Ahmed S. Darwish <ahmed.darwish@valeo.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

diff --git a/drivers/net/can/usb/kvaser_usb.c b/drivers/net/can/usb/kvaser_usb.c
index cc7bfc0c0a7134cfeb54362ebf49b76364f5e13d..c32cd61073bcc71048899f0ccb04cbcef2fe293c 100644 (file)
--- a/drivers/net/can/usb/kvaser_usb.c
+++ b/drivers/net/can/usb/kvaser_usb.c
@@ -520,10 +520,10 @@ static void kvaser_usb_tx_acknowledge(const struct kvaser_usb *dev,
                skb = alloc_can_err_skb(priv->netdev, &cf);
                if (skb) {
                        cf->can_id |= CAN_ERR_RESTARTED;
-                       netif_rx(skb);
 
                        stats->rx_packets++;
                        stats->rx_bytes += cf->can_dlc;
+                       netif_rx(skb);
                } else {
                        netdev_err(priv->netdev,
                                   "No memory left for err_skb\n");
@@ -770,10 +770,9 @@ static void kvaser_usb_rx_error(const struct kvaser_usb *dev,
 
        priv->can.state = new_state;
 
-       netif_rx(skb);
-
        stats->rx_packets++;
        stats->rx_bytes += cf->can_dlc;
+       netif_rx(skb);
 }
 
 static void kvaser_usb_rx_can_err(const struct kvaser_usb_net_priv *priv,
@@ -805,10 +804,9 @@ static void kvaser_usb_rx_can_err(const struct kvaser_usb_net_priv *priv,
                stats->rx_over_errors++;
                stats->rx_errors++;
 
-               netif_rx(skb);
-
                stats->rx_packets++;
                stats->rx_bytes += cf->can_dlc;
+               netif_rx(skb);
        }
 }
 
@@ -887,10 +885,9 @@ static void kvaser_usb_rx_can_msg(const struct kvaser_usb *dev,
                               cf->can_dlc);
        }
 
-       netif_rx(skb);
-
        stats->rx_packets++;
        stats->rx_bytes += cf->can_dlc;
+       netif_rx(skb);
 }
 
 static void kvaser_usb_start_chip_reply(const struct kvaser_usb *dev,