diff options
Diffstat (limited to 'net/can')
| -rw-r--r-- | net/can/af_can.c | 26 | ||||
| -rw-r--r-- | net/can/bcm.c | 29 | ||||
| -rw-r--r-- | net/can/raw.c | 3 |
3 files changed, 44 insertions, 14 deletions
diff --git a/net/can/af_can.c b/net/can/af_can.c index 2759b76f731..484bbf6dd03 100644 --- a/net/can/af_can.c +++ b/net/can/af_can.c @@ -205,11 +205,19 @@ static int can_create(struct net *net, struct socket *sock, int protocol) * -ENOBUFS on full driver queue (see net_xmit_errno()) * -ENOMEM when local loopback failed at calling skb_clone() * -EPERM when trying to send on a non-CAN interface + * -EINVAL when the skb->data does not contain a valid CAN frame */ int can_send(struct sk_buff *skb, int loop) { + struct sk_buff *newskb = NULL; + struct can_frame *cf = (struct can_frame *)skb->data; int err; + if (skb->len != sizeof(struct can_frame) || cf->can_dlc > 8) { + kfree_skb(skb); + return -EINVAL; + } + if (skb->dev->type != ARPHRD_CAN) { kfree_skb(skb); return -EPERM; @@ -244,8 +252,7 @@ int can_send(struct sk_buff *skb, int loop) * If the interface is not capable to do loopback * itself, we do it here. */ - struct sk_buff *newskb = skb_clone(skb, GFP_ATOMIC); - + newskb = skb_clone(skb, GFP_ATOMIC); if (!newskb) { kfree_skb(skb); return -ENOMEM; @@ -254,7 +261,6 @@ int can_send(struct sk_buff *skb, int loop) newskb->sk = skb->sk; newskb->ip_summed = CHECKSUM_UNNECESSARY; newskb->pkt_type = PACKET_BROADCAST; - netif_rx(newskb); } } else { /* indication for the CAN driver: no loopback required */ @@ -266,11 +272,20 @@ int can_send(struct sk_buff *skb, int loop) if (err > 0) err = net_xmit_errno(err); + if (err) { + if (newskb) + kfree_skb(newskb); + return err; + } + + if (newskb) + netif_rx(newskb); + /* update statistics */ can_stats.tx_frames++; can_stats.tx_frames_delta++; - return err; + return 0; } EXPORT_SYMBOL(can_send); @@ -597,6 +612,7 @@ static int can_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) { struct dev_rcv_lists *d; + struct can_frame *cf = (struct can_frame *)skb->data; int matches; if (dev->type != ARPHRD_CAN || dev_net(dev) != &init_net) { @@ -604,6 +620,8 @@ static int can_rcv(struct sk_buff *skb, struct net_device *dev, return 0; } + BUG_ON(skb->len != sizeof(struct can_frame) || cf->can_dlc > 8); + /* update statistics */ can_stats.rx_frames++; can_stats.rx_frames_delta++; diff --git a/net/can/bcm.c b/net/can/bcm.c index 74fd2d33aff..72c2ce904f8 100644 --- a/net/can/bcm.c +++ b/net/can/bcm.c @@ -298,7 +298,7 @@ static void bcm_send_to_user(struct bcm_op *op, struct bcm_msg_head *head, if (head->nframes) { /* can_frames starting here */ - firstframe = (struct can_frame *) skb_tail_pointer(skb); + firstframe = (struct can_frame *)skb_tail_pointer(skb); memcpy(skb_put(skb, datalen), frames, datalen); @@ -412,12 +412,6 @@ static void bcm_rx_changed(struct bcm_op *op, struct can_frame *data) bcm_send_to_user(op, &head, data, 1); } -/* TODO: move to linux/hrtimer.h */ -static inline int hrtimer_callback_running(struct hrtimer *timer) -{ - return timer->state & HRTIMER_STATE_CALLBACK; -} - /* * bcm_rx_update_and_send - process a detected relevant receive content change * 1. update the last received data @@ -832,6 +826,10 @@ static int bcm_tx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg, for (i = 0; i < msg_head->nframes; i++) { err = memcpy_fromiovec((u8 *)&op->frames[i], msg->msg_iov, CFSIZ); + + if (op->frames[i].can_dlc > 8) + err = -EINVAL; + if (err < 0) return err; @@ -864,6 +862,10 @@ static int bcm_tx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg, for (i = 0; i < msg_head->nframes; i++) { err = memcpy_fromiovec((u8 *)&op->frames[i], msg->msg_iov, CFSIZ); + + if (op->frames[i].can_dlc > 8) + err = -EINVAL; + if (err < 0) { if (op->frames != &op->sframe) kfree(op->frames); @@ -1170,9 +1172,12 @@ static int bcm_tx_send(struct msghdr *msg, int ifindex, struct sock *sk) skb->dev = dev; skb->sk = sk; - can_send(skb, 1); /* send with loopback */ + err = can_send(skb, 1); /* send with loopback */ dev_put(dev); + if (err) + return err; + return CFSIZ + MHSIZ; } @@ -1191,6 +1196,10 @@ static int bcm_sendmsg(struct kiocb *iocb, struct socket *sock, if (!bo->bound) return -ENOTCONN; + /* check for valid message length from userspace */ + if (size < MHSIZ || (size - MHSIZ) % CFSIZ) + return -EINVAL; + /* check for alternative ifindex for this bcm_op */ if (!ifindex && msg->msg_name) { @@ -1265,8 +1274,8 @@ static int bcm_sendmsg(struct kiocb *iocb, struct socket *sock, break; case TX_SEND: - /* we need at least one can_frame */ - if (msg_head.nframes < 1) + /* we need exactly one can_frame behind the msg head */ + if ((msg_head.nframes != 1) || (size != CFSIZ + MHSIZ)) ret = -EINVAL; else ret = bcm_tx_send(msg, ifindex, sk); diff --git a/net/can/raw.c b/net/can/raw.c index 69877b8e7e9..3e46ee36a1a 100644 --- a/net/can/raw.c +++ b/net/can/raw.c @@ -632,6 +632,9 @@ static int raw_sendmsg(struct kiocb *iocb, struct socket *sock, } else ifindex = ro->ifindex; + if (size != sizeof(struct can_frame)) + return -EINVAL; + dev = dev_get_by_index(&init_net, ifindex); if (!dev) return -ENXIO; |