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| author |   Oliver Hartkopp <socketcan@hartkopp.net> | 2022-03-16 17:42:57 +0100 |
|---|---|---|
| committer |   Marc Kleine-Budde <mkl@pengutronix.de> | 2022-03-16 21:41:40 +0100 |
| commit | 30ffd5332e06316bd69a654c06aa033872979b7c (patch) | |
| tree | f6706cff0e5a3525728b1d34548144ab27302ca0 /net/can/isotp.c | |
| parent | can: isotp: sanitize CAN ID checks in isotp_bind() (diff) | |
| download | wireguard-linux-30ffd5332e06316bd69a654c06aa033872979b7c.tar.xz wireguard-linux-30ffd5332e06316bd69a654c06aa033872979b7c.zip | |
can: isotp: return -EADDRNOTAVAIL when reading from unbound socket
When reading from an unbound can-isotp socket the syscall blocked
indefinitely. As unbound sockets (without given CAN address information)
do not make sense anyway we directly return -EADDRNOTAVAIL on read()
analogue to the known behavior from sendmsg().
Fixes: e057dd3fc20f ("can: add ISO 15765-2:2016 transport protocol")
Link: https://github.com/linux-can/can-utils/issues/349
Link: https://lore.kernel.org/all/20220316164258.54155-2-socketcan@hartkopp.net
Suggested-by: Derek Will <derekrobertwill@gmail.com>
Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Diffstat (limited to 'net/can/isotp.c')
| -rw-r--r-- | net/can/isotp.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/net/can/isotp.c b/net/can/isotp.c index 1662103ce125..6b6c82206c30 100644 --- a/net/can/isotp.c +++ b/net/can/isotp.c @@ -1046,12 +1046,16 @@ static int isotp_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, { struct sock *sk = sock->sk; struct sk_buff *skb; + struct isotp_sock *so = isotp_sk(sk); int err = 0; int noblock; noblock = flags & MSG_DONTWAIT; flags &= ~MSG_DONTWAIT; + if (!so->bound) + return -EADDRNOTAVAIL; + skb = skb_recv_datagram(sk, flags, noblock, &err); if (!skb) return err; |