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 @@ -1144,6 +1144,11 @@ 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; @@ -1154,10 +1159,6 @@ 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; @@ -1184,19 +1185,6 @@ 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;