netdev - [net 2/3] can: isotp: isotp_setsockopt(): block setsockopt on bound sockets

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Message-Id: <20201204133508.742120-3-mkl@pengutronix.de>
Date:   Fri,  4 Dec 2020 14:35:07 +0100
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, kuba@...nel.org, linux-can@...r.kernel.org,
        kernel@...gutronix.de, Oliver Hartkopp <socketcan@...tkopp.net>,
        Thomas Wagner <thwa1@....de>,
        Marc Kleine-Budde <mkl@...gutronix.de>
Subject: [net 2/3] can: isotp: isotp_setsockopt(): block setsockopt on bound sockets

From: Oliver Hartkopp <socketcan@...tkopp.net>

The isotp socket can be widely configured in its behaviour regarding addressing
types, fill-ups, receive pattern tests and link layer length. Usually all
these settings need to be fixed before bind() and can not be changed
afterwards.

This patch adds a check to enforce the common usage pattern.

Fixes: e057dd3fc20f ("can: add ISO 15765-2:2016 transport protocol")
Signed-off-by: Oliver Hartkopp <socketcan@...tkopp.net>
Tested-by: Thomas Wagner <thwa1@....de>
Link: https://lore.kernel.org/r/20201203140604.25488-2-socketcan@hartkopp.net
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
---
 net/can/isotp.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/can/isotp.c b/net/can/isotp.c
index d78ab13bd8be..26bdc3c20b7e 100644
--- a/net/can/isotp.c
+++ b/net/can/isotp.c
@@ -1157,6 +1157,9 @@ static int isotp_setsockopt(struct socket *sock, int level, int optname,
 	if (level != SOL_CAN_ISOTP)
 		return -EINVAL;
 
+	if (so->bound)
+		return -EISCONN;
+
 	switch (optname) {
 	case CAN_ISOTP_OPTS:
 		if (optlen != sizeof(struct can_isotp_options))
-- 
2.29.2