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linux/net/can
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Oleksij Rempel ed581989d7 net: can: j1939: enhanced error handling for tightly received RTS messages in xtp_rx_rts_session_new 
commit d3e2904f71 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2024-07-05 09:08:30 +02:00
..
j1939 net: can: j1939: enhanced error handling for tightly received RTS messages in xtp_rx_rts_session_new 2024-07-05 09:08:30 +02:00
af_can.c can: af_can: fix NULL pointer dereference in can_rcv_filter 2022-12-14 11:30:44 +01:00
af_can.h can: introduce CAN midlayer private and allocate it automatically 2019-09-04 13:29:14 +02:00
bcm.c can: bcm: Fix UAF in bcm_proc_show() 2023-07-27 08:37:40 +02:00
gw.c can: gw: synchronize rcu operations before removing gw job entry 2021-07-14 16:53:04 +02:00
Kconfig can: add support of SAE J1939 protocol 2019-09-04 14:22:33 +02:00
Makefile can: add support of SAE J1939 protocol 2019-09-04 14:22:33 +02:00
proc.c net: introduce CAN specific pointer in the struct net_device 2021-04-07 14:47:41 +02:00
raw.c can: raw: add support for SO_MARK 2024-01-15 18:25:25 +01:00