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can: j1939: transport: j1939_xtp_rx_eoma_one(): Add sanity check for correct total message size 

We were sending malformed EOMA with total message size set to 0. This
issue has been fixed in the previous patch.

In this patch a sanity check is added to the RX path and a error message
is displayed.

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Oleksij Rempel 2019-10-25 15:04:13 +02:00 committed by Marc Kleine-Budde
parent eaa654f164
commit 688d11c384
1 changed files with 18 additions and 0 deletions
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18
net/can/j1939/transport.c
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@ -1273,9 +1273,27 @@ j1939_xtp_rx_abort(struct j1939_priv *priv, struct sk_buff *skb,
static void
j1939_xtp_rx_eoma_one(struct j1939_session *session, struct sk_buff *skb)
{
struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb);
const u8 *dat;
int len;
if (j1939_xtp_rx_cmd_bad_pgn(session, skb))
return;
dat = skb->data;
if (skcb->addr.type == J1939_ETP)
len = j1939_etp_ctl_to_size(dat);
else
len = j1939_tp_ctl_to_size(dat);
if (session->total_message_size != len) {
netdev_warn_once(session->priv->ndev,
"%s: 0x%p: Incorrect size. Expected: %i; got: %i.\n",
__func__, session, session->total_message_size,
len);
}
netdev_dbg(session->priv->ndev, "%s: 0x%p\n", __func__, session);
session->pkt.tx_acked = session->pkt.total;