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authorZhang Changzhong <zhangchangzhong@huawei.com>2021-09-30 11:33:20 +0800
committerMarc Kleine-Budde <mkl@pengutronix.de>2021-10-17 14:12:56 +0200
commit379743985ab6cfe2cbd32067cf4ed497baca6d06 (patch)
tree8f3b21835ccac1695d55f07272dacec6d27f27e8 /net/can
parentd9d52a3ebd284882f5562c88e55991add5d01586 (diff)
can: j1939: j1939_xtp_rx_dat_one(): cancel session if receive TP.DT with error length
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>
Diffstat (limited to 'net/can')
-rw-r--r--net/can/j1939/transport.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/net/can/j1939/transport.c b/net/can/j1939/transport.c
index bfb0718d4587..1ea6fee3d986 100644
--- a/net/can/j1939/transport.c
+++ b/net/can/j1939/transport.c
@@ -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);
}