diff options
| author | Oliver Hartkopp <socketcan@hartkopp.net> | 2018-10-24 10:27:12 +0200 |
|---|---|---|
| committer | Marc Kleine-Budde <mkl@pengutronix.de> | 2018-11-09 17:19:34 +0100 |
| commit | a43608fa77213ad5ac5f75994254b9f65d57cfa0 (patch) | |
| tree | d38141aba4e346a66443928a5e42a0f7f38c8b71 /net/can/raw.c | |
| parent | 85b18b0237ce9986a81a1b9534b5e2ee116f5504 (diff) | |
| download | linux-a43608fa77213ad5ac5f75994254b9f65d57cfa0.tar.bz2 | |
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/raw.c')
| -rw-r--r-- | net/can/raw.c | 15 |
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) |