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can: isotp: remove re-binding of bound socket 

commit 72ed3ee9fa 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: e057dd3fc2 ("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>
This commit is contained in:
Oliver Hartkopp 2022-04-22 10:23:37 +02:00 committed by Greg Kroah-Hartman
parent 0d98009794
commit 8f565cf206
1 changed files with 5 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
net/can/isotp.c
View File

@ -1146,6 +1146,11 @@ static int isotp_bind(struct socket *sock, struct sockaddr *uaddr, int len)
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 *sock, struct sockaddr *uaddr, int len)
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 *sock, struct sockaddr *uaddr, int len)
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;