can: bfin_can: don't touch skb after netif_rx()

There is no guarantee that the skb is in the same state after calling
net_receive_skb() or netif_rx(). It might be freed or reused. Not really
harmful as its a read access, except you turn on the proper debugging options
which catch a use after free.

Cc: Aaron Wu <Aaron.wu@analog.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

diff --git a/drivers/net/can/bfin_can.c b/drivers/net/can/bfin_can.c
index 27ad312e7abf34bdf94a86ce66fa5ae900da1aed..57dadd52b428a536d71f2364c006641e5e765083 100644 (file)
--- a/drivers/net/can/bfin_can.c
+++ b/drivers/net/can/bfin_can.c
@@ -424,10 +424,9 @@ static void bfin_can_rx(struct net_device *dev, u16 isrc)
                cf->data[6 - i] = (6 - i) < cf->can_dlc ? (val >> 8) : 0;
        }
 
-       netif_rx(skb);
-
        stats->rx_packets++;
        stats->rx_bytes += cf->can_dlc;
+       netif_rx(skb);
 }
 
 static int bfin_can_err(struct net_device *dev, u16 isrc, u16 status)
@@ -508,10 +507,9 @@ static int bfin_can_err(struct net_device *dev, u16 isrc, u16 status)
 
        priv->can.state = state;
 
-       netif_rx(skb);
-
        stats->rx_packets++;
        stats->rx_bytes += cf->can_dlc;
+       netif_rx(skb);
 
        return 0;
 }