[PATCH 5.15 033/135] can: isotp: remove re-binding of bound socket

Greg Kroah-Hartman
2022-05-10T14:03:56Z

From: Oliver Hartkopp <socketcan@hartkopp.net>

commit 72ed3ee9fa0b461ad086403a8b5336154bd82234 upstream.

As a carry over from the CAN_RAW socket (which allows to change the CAN
interface while mantaining the filter setup) the re-binding of the
CAN_ISOTP socket needs to take care about CAN ID address information and
subscriptions. It turned out that this feature is so limited (e.g. the
sockopts remain fix) that it finally has never been needed/used.

In opposite to the stateless CAN_RAW socket the switching of the CAN ID
subscriptions might additionally lead to an interrupted ongoing PDU
reception. So better remove this unneeded complexity.

Fixes: e057dd3fc20f ("can: add ISO 15765-2:2016 transport protocol")
Link: https://lore.kernel.org/all/20220422082337.1676-1-socketcan@hartkopp.net
Cc: stable@vger.kernel.org
Signed-off-by: Oliver Hartkopp <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 | 22 +++++-----------------
1 file changed, 5 insertions(+), 17 deletions(-)

--- a/net/can/isotp.c
+++ b/net/can/isotp.c
@@ -1146,6 +1146,11 @@ static int isotp_bind(struct socket *soc

lock_sock(sk);

+ if (so->bound) {
+ err = -EINVAL;
+ goto out;
+ }
+
/* do not register frame reception for functional addressing */
if (so->opt.flags & CAN_ISOTP_SF_BROADCAST)
do_rx_reg = 0;
@@ -1156,10 +1161,6 @@ static int isotp_bind(struct socket *soc
goto out;
}

- if (so->bound && addr->can_ifindex == so->ifindex &&
- rx_id == so->rxid && tx_id == so->txid)
- goto out;
-
dev = dev_get_by_index(net, addr->can_ifindex);
if (!dev) {
err = -ENODEV;
@@ -1186,19 +1187,6 @@ static int isotp_bind(struct socket *soc

dev_put(dev);

- if (so->bound && do_rx_reg) {
- /* unregister old filter */
- if (so->ifindex) {
- dev = dev_get_by_index(net, so->ifindex);
- if (dev) {
- can_rx_unregister(net, dev, so->rxid,
- SINGLE_MASK(so->rxid),
- isotp_rcv, sk);
- dev_put(dev);
- }
- }
- }
-
/* switch to new settings */
so->ifindex = ifindex;
so->rxid = rx_id;