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can: isotp: isotp_bind(): do not validate unused address information 

With commit 2aa39889c4 ("can: isotp: isotp_bind(): return -EINVAL on
incorrect CAN ID formatting") the bind() syscall returns -EINVAL when
the given CAN ID needed to be sanitized. But in the case of an unconfirmed
broadcast mode the rx CAN ID is not needed and may be uninitialized from
the caller - which is ok.

This patch makes sure the result of an inproper CAN ID format is only
provided when the address information is needed.

Link: https://lore.kernel.org/all/20220517145653.2556-1-socketcan@hartkopp.net
Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Oliver Hartkopp 2022-05-17 16:56:53 +02:00 committed by Marc Kleine-Budde
parent d7e6f58360
commit b76b163f46
1 changed files with 17 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

29
net/can/isotp.c
View File

@ -1212,31 +1212,36 @@ static int isotp_bind(struct socket *sock, struct sockaddr *uaddr, int len)
struct net *net = sock_net(sk);
int ifindex;
struct net_device *dev;
canid_t tx_id, rx_id;
canid_t tx_id = addr->can_addr.tp.tx_id;
canid_t rx_id = addr->can_addr.tp.rx_id;
int err = 0;
int notify_enetdown = 0;
if (len < ISOTP_MIN_NAMELEN)
return -EINVAL;
/* sanitize tx/rx CAN identifiers */
tx_id = addr->can_addr.tp.tx_id;
/* sanitize tx CAN identifier */
if (tx_id & CAN_EFF_FLAG)
tx_id &= (CAN_EFF_FLAG | CAN_EFF_MASK);
else
tx_id &= CAN_SFF_MASK;
rx_id = addr->can_addr.tp.rx_id;
if (rx_id & CAN_EFF_FLAG)
rx_id &= (CAN_EFF_FLAG | CAN_EFF_MASK);
else
rx_id &= CAN_SFF_MASK;
/* give feedback on wrong CAN-ID values */
if (tx_id != addr->can_addr.tp.tx_id ||
rx_id != addr->can_addr.tp.rx_id)
/* give feedback on wrong CAN-ID value */
if (tx_id != addr->can_addr.tp.tx_id)
return -EINVAL;
/* sanitize rx CAN identifier (if needed) */
if (isotp_register_rxid(so)) {
if (rx_id & CAN_EFF_FLAG)
rx_id &= (CAN_EFF_FLAG | CAN_EFF_MASK);
else
rx_id &= CAN_SFF_MASK;
/* give feedback on wrong CAN-ID value */
if (rx_id != addr->can_addr.tp.rx_id)
return -EINVAL;
}
if (!addr->can_ifindex)
return -ENODEV;