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authorOliver Hartkopp <socketcan@hartkopp.net>2021-03-25 15:58:49 +0300
committerMarc Kleine-Budde <mkl@pengutronix.de>2021-03-29 10:51:43 +0300
commitf522d9559b07854c231cf8f0b8cb5a3578f8b44e (patch)
tree6887546071b57eec92b9a60b2a49f11c75bf6c0f /net/can
parent9e9714742fb70467464359693a73b911a630226f (diff)
downloadlinux-f522d9559b07854c231cf8f0b8cb5a3578f8b44e.tar.xz
can: isotp: fix msg_namelen values depending on CAN_REQUIRED_SIZE
Since commit f5223e9eee65 ("can: extend sockaddr_can to include j1939 members") the sockaddr_can has been extended in size and a new CAN_REQUIRED_SIZE macro has been introduced to calculate the protocol specific needed size. The ABI for the msg_name and msg_namelen has not been adapted to the new CAN_REQUIRED_SIZE macro for the other CAN protocols which leads to a problem when an existing binary reads the (increased) struct sockaddr_can in msg_name. Fixes: e057dd3fc20f ("can: add ISO 15765-2:2016 transport protocol") Reported-by: Richard Weinberger <richard@nod.at> Acked-by: Kurt Van Dijck <dev.kurt@vandijck-laurijssen.be> Link: https://lore.kernel.org/linux-can/1135648123.112255.1616613706554.JavaMail.zimbra@nod.at/T/#t Link: https://lore.kernel.org/r/20210325125850.1620-2-socketcan@hartkopp.net Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Diffstat (limited to 'net/can')
-rw-r--r--net/can/isotp.c11
1 files changed, 7 insertions, 4 deletions
diff --git a/net/can/isotp.c b/net/can/isotp.c
index 15ea1234d457..9f94ad3caee9 100644
--- a/net/can/isotp.c
+++ b/net/can/isotp.c
@@ -77,6 +77,8 @@ MODULE_LICENSE("Dual BSD/GPL");
MODULE_AUTHOR("Oliver Hartkopp <socketcan@hartkopp.net>");
MODULE_ALIAS("can-proto-6");
+#define ISOTP_MIN_NAMELEN CAN_REQUIRED_SIZE(struct sockaddr_can, can_addr.tp)
+
#define SINGLE_MASK(id) (((id) & CAN_EFF_FLAG) ? \
(CAN_EFF_MASK | CAN_EFF_FLAG | CAN_RTR_FLAG) : \
(CAN_SFF_MASK | CAN_EFF_FLAG | CAN_RTR_FLAG))
@@ -986,7 +988,8 @@ static int isotp_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
sock_recv_timestamp(msg, sk, skb);
if (msg->msg_name) {
- msg->msg_namelen = sizeof(struct sockaddr_can);
+ __sockaddr_check_size(ISOTP_MIN_NAMELEN);
+ msg->msg_namelen = ISOTP_MIN_NAMELEN;
memcpy(msg->msg_name, skb->cb, msg->msg_namelen);
}
@@ -1056,7 +1059,7 @@ static int isotp_bind(struct socket *sock, struct sockaddr *uaddr, int len)
int notify_enetdown = 0;
int do_rx_reg = 1;
- if (len < CAN_REQUIRED_SIZE(struct sockaddr_can, can_addr.tp))
+ if (len < ISOTP_MIN_NAMELEN)
return -EINVAL;
/* do not register frame reception for functional addressing */
@@ -1152,13 +1155,13 @@ static int isotp_getname(struct socket *sock, struct sockaddr *uaddr, int peer)
if (peer)
return -EOPNOTSUPP;
- memset(addr, 0, sizeof(*addr));
+ memset(addr, 0, ISOTP_MIN_NAMELEN);
addr->can_family = AF_CAN;
addr->can_ifindex = so->ifindex;
addr->can_addr.tp.rx_id = so->rxid;
addr->can_addr.tp.tx_id = so->txid;
- return sizeof(*addr);
+ return ISOTP_MIN_NAMELEN;
}
static int isotp_setsockopt(struct socket *sock, int level, int optname,