From: Oleksij Rempel o.rempel@pengutronix.de
[ Upstream commit b43e3a82bc432c1caaed8950e7662c143470c54c ]
In current J1939 stack implementation, we process all locally send messages as own messages. Even if it was send by CAN_RAW socket.
To reproduce it use following commands: testj1939 -P -r can0:0x80 & cansend can0 18238040#0123
This step will trigger false positive not critical warning: j1939_simple_recv: Received already invalidated message
With this patch we add additional check to make sure, related skb is own echo message.
Fixes: 9d71dd0c7009 ("can: add support of SAE J1939 protocol") Signed-off-by: Oleksij Rempel o.rempel@pengutronix.de Link: https://lore.kernel.org/r/20200807105200.26441-2-o.rempel@pengutronix.de Signed-off-by: Marc Kleine-Budde mkl@pengutronix.de Signed-off-by: Sasha Levin sashal@kernel.org --- net/can/j1939/socket.c | 1 + net/can/j1939/transport.c | 4 ++++ 2 files changed, 5 insertions(+)
diff --git a/net/can/j1939/socket.c b/net/can/j1939/socket.c index 1b7dc1a8547f3..bf9fd6ee88fe0 100644 --- a/net/can/j1939/socket.c +++ b/net/can/j1939/socket.c @@ -398,6 +398,7 @@ static int j1939_sk_init(struct sock *sk) spin_lock_init(&jsk->sk_session_queue_lock); INIT_LIST_HEAD(&jsk->sk_session_queue); sk->sk_destruct = j1939_sk_sock_destruct; + sk->sk_protocol = CAN_J1939;
return 0; } diff --git a/net/can/j1939/transport.c b/net/can/j1939/transport.c index 5bfe6bf15a999..30957c9a8eb7a 100644 --- a/net/can/j1939/transport.c +++ b/net/can/j1939/transport.c @@ -2032,6 +2032,10 @@ void j1939_simple_recv(struct j1939_priv *priv, struct sk_buff *skb) if (!skb->sk) return;
+ if (skb->sk->sk_family != AF_CAN || + skb->sk->sk_protocol != CAN_J1939) + return; + j1939_session_list_lock(priv); session = j1939_session_get_simple(priv, skb); j1939_session_list_unlock(priv);