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can: j1939: j1939_xtp_rx_dat_one(): cancel session if receive TP.DT with error length

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According to SAE-J1939-21, the data length of TP.DT must be 8 bytes, so
cancel session when receive unexpected TP.DT message.

Fixes: 9d71dd0c7009 ("can: add support of SAE J1939 protocol")
Link: https://lore.kernel.org/all/1632972800-45091-1-git-send-email-zhangchangzhong@huawei.com
Cc: stable@vger.kernel.org
Signed-off-by: Zhang Changzhong <zhangchangzhong@huawei.com>
Acked-by: Oleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Zhang Changzhong 2021-09-30 11:33:20 +08:00 committed by Marc Kleine-Budde
parent d9d52a3ebd
commit 379743985a
1 changed files with 5 additions and 2 deletions
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7
net/can/j1939/transport.c
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@ -1788,6 +1788,7 @@ static void j1939_xtp_rx_dpo(struct j1939_priv *priv, struct sk_buff *skb,
static void j1939_xtp_rx_dat_one(struct j1939_session *session,
struct sk_buff *skb)
{
enum j1939_xtp_abort abort = J1939_XTP_ABORT_FAULT;
struct j1939_priv *priv = session->priv;
struct j1939_sk_buff_cb *skcb, *se_skcb;
struct sk_buff *se_skb = NULL;
@ -1802,9 +1803,11 @@ static void j1939_xtp_rx_dat_one(struct j1939_session *session,
skcb = j1939_skb_to_cb(skb);
dat = skb->data;
if (skb->len <= 1)
if (skb->len != 8) {
/* makes no sense */
abort = J1939_XTP_ABORT_UNEXPECTED_DATA;
goto out_session_cancel;
}
switch (session->last_cmd) {
case 0xff:
@ -1903,7 +1906,7 @@ static void j1939_xtp_rx_dat_one(struct j1939_session *session,
out_session_cancel:
kfree_skb(se_skb);
j1939_session_timers_cancel(session);
j1939_session_cancel(session, J1939_XTP_ABORT_FAULT);
j1939_session_cancel(session, abort);
j1939_session_put(session);
}