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can: isotp: isotp_setsockopt(): block setsockopt on bound sockets 

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: e057dd3fc2 ("can: add ISO 15765-2:2016 transport protocol")
Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
Tested-by: Thomas Wagner <thwa1@web.de>
Link: https://lore.kernel.org/r/20201203140604.25488-2-socketcan@hartkopp.net
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Link: https://lore.kernel.org/r/20201204133508.742120-3-mkl@pengutronix.de
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Oliver Hartkopp 2020-12-04 14:35:07 +01:00 committed by Jakub Kicinski
parent 72d05c00d7
commit 323a391a22
1 changed files with 3 additions and 0 deletions
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3
net/can/isotp.c
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@ -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))