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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: e057dd3fc2 ("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>
This commit is contained in:
Oliver Hartkopp 2022-03-16 17:42:57 +01:00 committed by Marc Kleine-Budde
parent 3ea566422c
commit 30ffd5332e
1 changed files with 4 additions and 0 deletions
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4
net/can/isotp.c
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@ -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;