From 30a63e7ef37f581ab36a2916618f757b022ff518 Mon Sep 17 00:00:00 2001 From: Oliver Hartkopp Date: Fri, 22 Apr 2022 10:23:37 +0200 Subject: [PATCH] can: isotp: remove re-binding of bound socket 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 Signed-off-by: Marc Kleine-Budde Signed-off-by: Greg Kroah-Hartman --- net/can/isotp.c | 22 +++++----------------- 1 file changed, 5 insertions(+), 17 deletions(-) diff --git a/net/can/isotp.c b/net/can/isotp.c index 8c753dc..2682148 100644 --- a/net/can/isotp.c +++ b/net/can/isotp.c @@ -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; -- 2.7.4