From: Oliver Hartkopp socketcan@hartkopp.net

When wait_event_interruptible() has been interrupted by a signal the tx.state value might not be ISOTP_IDLE. Force the state machines into idle state to inhibit the timer handlers to continue working.

Fixes: 866337865f37 ("can: isotp: fix tx state handling for echo tx processing") Cc: stable@vger.kernel.org Signed-off-by: Oliver Hartkopp socketcan@hartkopp.net Link: https://lore.kernel.org/all/20230112192347.1944-1-socketcan@hartkopp.net Signed-off-by: Marc Kleine-Budde mkl@pengutronix.de --- net/can/isotp.c | 4 ++++ 1 file changed, 4 insertions(+)

diff --git a/net/can/isotp.c b/net/can/isotp.c index 608f8c24ae46..dae421f6c901 100644 --- a/net/can/isotp.c +++ b/net/can/isotp.c @@ -1162,6 +1162,10 @@ static int isotp_release(struct socket *sock) /* wait for complete transmission of current pdu */ wait_event_interruptible(so->wait, so->tx.state == ISOTP_IDLE);

+ /* force state machines to be idle also when a signal occurred */ + so->tx.state = ISOTP_IDLE; + so->rx.state = ISOTP_IDLE; + spin_lock(&isotp_notifier_lock); while (isotp_busy_notifier == so) { spin_unlock(&isotp_notifier_lock);