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net: can: j1939: enhanced error handling for tightly received RTS messages in xtp_rx_rts_session_new

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This patch enhances error handling in scenarios with RTS (Request to
Send) messages arriving closely. It replaces the less informative WARN_ON_ONCE
backtraces with a new error handling method. This provides clearer error
messages and allows for the early termination of problematic sessions.
Previously, sessions were only released at the end of j1939_xtp_rx_rts().

Potentially this could be reproduced with something like:
testj1939 -r vcan0:0x80 &
while true; do
	# send first RTS
	cansend vcan0 18EC8090#1014000303002301;
	# send second RTS
	cansend vcan0 18EC8090#1014000303002301;
	# send abort
	cansend vcan0 18EC8090#ff00000000002301;
done

Fixes: 9d71dd0c70 ("can: add support of SAE J1939 protocol")
Reported-by: syzbot+daa36413a5cedf799ae4@syzkaller.appspotmail.com
Cc: stable@vger.kernel.org
Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Link: https://lore.kernel.org/all/20231117124959.961171-1-o.rempel@pengutronix.de
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Oleksij Rempel 2023-11-17 13:49:59 +01:00 committed by Marc Kleine-Budde
parent 8851346912
commit d3e2904f71
1 changed files with 17 additions and 2 deletions
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19
net/can/j1939/transport.c
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@ -1593,8 +1593,8 @@ j1939_session *j1939_xtp_rx_rts_session_new(struct j1939_priv *priv,
struct j1939_sk_buff_cb skcb = *j1939_skb_to_cb(skb);
struct j1939_session *session;
const u8 *dat;
int len, ret;
pgn_t pgn;
int len;
netdev_dbg(priv->ndev, "%s\n", __func__);
@ -1653,7 +1653,22 @@ j1939_session *j1939_xtp_rx_rts_session_new(struct j1939_priv *priv,
session->tskey = priv->rx_tskey++;
j1939_sk_errqueue(session, J1939_ERRQUEUE_RX_RTS);
WARN_ON_ONCE(j1939_session_activate(session));
ret = j1939_session_activate(session);
if (ret) {
/* Entering this scope indicates an issue with the J1939 bus.
* Possible scenarios include:
* - A time lapse occurred, and a new session was initiated
* due to another packet being sent correctly. This could
* have been caused by too long interrupt, debugger, or being
* out-scheduled by another task.
* - The bus is receiving numerous erroneous packets, either
* from a malfunctioning device or during a test scenario.
*/
netdev_alert(priv->ndev, "%s: 0x%p: concurrent session with same addr (%02x %02x) is already active.\n",
__func__, session, skcb.addr.sa, skcb.addr.da);
j1939_session_put(session);
return NULL;
}
return session;
}