Patch "can: isotp: handle wait_event_interruptible() return values" has been added to the 5.15-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    can: isotp: handle wait_event_interruptible() return values

to the 5.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     can-isotp-handle-wait_event_interruptible-return-values.patch
and it can be found in the queue-5.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


From stable-owner@vger.kernel.org Tue Oct 31 10:30:57 2023
From: Oliver Hartkopp <socketcan@hartkopp.net>
Date: Tue, 31 Oct 2023 10:30:22 +0100
Subject: can: isotp: handle wait_event_interruptible() return values
To: gregkh@linuxfoundation.org, stable@vger.kernel.org, sashal@kernel.org
Cc: linux-can@vger.kernel.org, lukas.magel@posteo.net, patches@lists.linux.dev, maxime.jayat@mobile-devices.fr, mkl@pengutronix.de, michal.sojka@cvut.cz, Oliver Hartkopp <socketcan@hartkopp.net>
Message-ID: <20231031093025.2699-5-socketcan@hartkopp.net>

From: Oliver Hartkopp <socketcan@hartkopp.net>

commit 823b2e42720f96f277940c37ea438b7c5ead51a4 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: 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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 net/can/isotp.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/net/can/isotp.c
+++ b/net/can/isotp.c
@@ -1071,6 +1071,10 @@ static int isotp_release(struct socket *
 	/* 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);


Patches currently in stable-queue which might be from stable-owner@vger.kernel.org are

queue-5.15/ext4-avoid-overlapping-preallocations-due-to-overflow.patch
queue-5.15/can-isotp-isotp_bind-do-not-validate-unused-address-information.patch
queue-5.15/can-isotp-set-max-pdu-size-to-64-kbyte.patch
queue-5.15/can-isotp-isotp_bind-return-einval-on-incorrect-can-id-formatting.patch
queue-5.15/ext4-fix-bug-in-ext4_mb_new_inode_pa-due-to-overflow.patch
queue-5.15/rpmsg-fix-calling-device_lock-on-non-initialized-device.patch
queue-5.15/can-isotp-isotp_sendmsg-fix-tx-state-detection-and-wait-behavior.patch
queue-5.15/rpmsg-constify-local-variable-in-field-store-macro.patch
queue-5.15/rpmsg-glink-release-driver_override.patch
queue-5.15/driver-platform-add-helper-for-safer-setting-of-driver_override.patch
queue-5.15/can-isotp-check-can-address-family-in-isotp_bind.patch
queue-5.15/rpmsg-fix-kfree-of-static-memory-on-setting-driver_override.patch
queue-5.15/can-isotp-add-local-echo-tx-processing-and-tx-without-fc.patch
queue-5.15/can-isotp-handle-wait_event_interruptible-return-values.patch
queue-5.15/rpmsg-fix-possible-refcount-leak-in-rpmsg_register_device_override.patch
queue-5.15/ext4-add-two-helper-functions-extent_logical_end-and-pa_logical_end.patch