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can: isotp: handle wait_event_interruptible() return values 

commit 823b2e4272 upstream.

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: 866337865f ("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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Oliver Hartkopp 2023-01-12 20:23:47 +01:00 committed by Greg Kroah-Hartman
parent cae4c9bc35
commit ad88608681
1 changed files with 4 additions and 0 deletions
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4
net/can/isotp.c
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@ -1152,6 +1152,10 @@ 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);