can: Unify droping of invalid tx skbs and netdev stats

To prevent the CAN drivers to operate on invalid socketbuffers the skbs are
now checked and silently dropped at the xmit-function consistently.

Also the netdev stats are consistently using the CAN data length code (dlc)
for [rx|tx]_bytes now.

Signed-off-by: Oliver Hartkopp <oliver@hartkopp.net>
Acked-by: Wolfgang Grandegger <wg@grandegger.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/net/can/at91_can.c b/drivers/net/can/at91_can.c
index 166cc7e579c0..f7287497ba6e 100644
--- a/drivers/net/can/at91_can.c
+++ b/drivers/net/can/at91_can.c
@@ -342,6 +342,9 @@ static netdev_tx_t at91_start_xmit(struct sk_buff *skb, struct net_device *dev)
         unsigned int mb, prio;
         u32 reg_mid, reg_mcr;
 
+        if (can_dropped_invalid_skb(dev, skb))
+                return NETDEV_TX_OK;
+
         mb = get_tx_next_mb(priv);
         prio = get_tx_next_prio(priv);