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/usb/ems_usb.c b/drivers/net/can/usb/ems_usb.c
index efbb05c71bf4..ddb17e256656 100644
--- a/drivers/net/can/usb/ems_usb.c
+++ b/drivers/net/can/usb/ems_usb.c
@@ -767,6 +767,9 @@ static netdev_tx_t ems_usb_start_xmit(struct sk_buff *skb, struct net_device *ne
         size_t size = CPC_HEADER_SIZE + CPC_MSG_HEADER_LEN
                         + sizeof(struct cpc_can_msg);
 
+        if (can_dropped_invalid_skb(netdev, skb))
+                return NETDEV_TX_OK;
+
         /* create a URB, and a buffer for it, and copy the data to the URB */
         urb = usb_alloc_urb(0, GFP_ATOMIC);
         if (!urb) {