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authorOliver Hartkopp <socketcan@hartkopp.net>2020-12-04 16:35:07 +0300
committerJakub Kicinski <kuba@kernel.org>2020-12-09 19:44:15 +0300
commit323a391a220c4a234cb1e678689d7f4c3b73f863 (patch)
treeae1119b3b9aa3c23f04c86be82de789f687e9626 /net/can
parent72d05c00d7ecda85df29abd046da7e41cc071c17 (diff)
downloadlinux-323a391a220c4a234cb1e678689d7f4c3b73f863.tar.xz
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: e057dd3fc20f ("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>
Diffstat (limited to 'net/can')
-rw-r--r--net/can/isotp.c3
1 files changed, 3 insertions, 0 deletions
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))