Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net

tools/testing/selftests/net/forwarding/Makefile
  f62c5acc800e ("selftests/net/forwarding: add missing tests to Makefile")
  50fe062c806e ("selftests: forwarding: new test, verify host mdb entries")
https://lore.kernel.org/all/20220502111539.0b7e4621@canb.auug.org.au/

Signed-off-by: Jakub Kicinski <kuba@kernel.org>

1 files changed, 5 insertions, 20 deletions

diff --git a/net/can/isotp.c b/net/can/isotp.c
index 11a65a9d3906..35a1ae61744c 100644
--- a/net/can/isotp.c
+++ b/net/can/isotp.c
@@ -1187,6 +1187,11 @@ 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;
@@ -1197,10 +1202,6 @@ 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;
@@ -1235,22 +1236,6 @@ 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);
-				can_rx_unregister(net, dev, so->txid,
-						  SINGLE_MASK(so->txid),
-						  isotp_rcv_echo, sk);
-				dev_put(dev);
-			}
-		}
-	}
-
 	/* switch to new settings */
 	so->ifindex = ifindex;
 	so->rxid = rx_id;