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authorOliver Hartkopp <socketcan@hartkopp.net>2018-10-24 10:27:12 +0200
committerMarc Kleine-Budde <mkl@pengutronix.de>2018-11-09 17:19:34 +0100
commita43608fa77213ad5ac5f75994254b9f65d57cfa0 (patch)
treed38141aba4e346a66443928a5e42a0f7f38c8b71 /net/can
parent85b18b0237ce9986a81a1b9534b5e2ee116f5504 (diff)
downloadlinux-stericsson-a43608fa77213ad5ac5f75994254b9f65d57cfa0.tar.gz
can: raw: check for CAN FD capable netdev in raw_sendmsg()
When the socket is CAN FD enabled it can handle CAN FD frame transmissions. Add an additional check in raw_sendmsg() as a CAN2.0 CAN driver (non CAN FD) should never see a CAN FD frame. Due to the commonly used can_dropped_invalid_skb() function the CAN 2.0 driver would drop that CAN FD frame anyway - but with this patch the user gets a proper -EINVAL return code. Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net> Cc: linux-stable <stable@vger.kernel.org> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Diffstat (limited to 'net/can')
-rw-r--r--net/can/raw.c15
1 files changed, 8 insertions, 7 deletions
diff --git a/net/can/raw.c b/net/can/raw.c
index 1051eee82581..3aab7664933f 100644
--- a/net/can/raw.c
+++ b/net/can/raw.c
@@ -745,18 +745,19 @@ static int raw_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
} else
ifindex = ro->ifindex;
- if (ro->fd_frames) {
+ dev = dev_get_by_index(sock_net(sk), ifindex);
+ if (!dev)
+ return -ENXIO;
+
+ err = -EINVAL;
+ if (ro->fd_frames && dev->mtu == CANFD_MTU) {
if (unlikely(size != CANFD_MTU && size != CAN_MTU))
- return -EINVAL;
+ goto put_dev;
} else {
if (unlikely(size != CAN_MTU))
- return -EINVAL;
+ goto put_dev;
}
- dev = dev_get_by_index(sock_net(sk), ifindex);
- if (!dev)
- return -ENXIO;
-
skb = sock_alloc_send_skb(sk, size + sizeof(struct can_skb_priv),
msg->msg_flags & MSG_DONTWAIT, &err);
if (!skb)