diff options
Diffstat (limited to 'net/can/af_can.c')
| -rw-r--r-- | net/can/af_can.c | 24 |
1 files changed, 17 insertions, 7 deletions
diff --git a/net/can/af_can.c b/net/can/af_can.c index e733725b11d..60683211567 100644 --- a/net/can/af_can.c +++ b/net/can/af_can.c @@ -199,6 +199,8 @@ static int can_create(struct net *net, struct socket *sock, int protocol) * @skb: pointer to socket buffer with CAN frame in data section * @loop: loopback for listeners on local CAN sockets (recommended default!) * + * Due to the loopback this routine must not be called from hardirq context. + * * Return: * 0 on success * -ENETDOWN when the selected interface is down @@ -278,7 +280,7 @@ int can_send(struct sk_buff *skb, int loop) } if (newskb) - netif_rx(newskb); + netif_rx_ni(newskb); /* update statistics */ can_stats.tx_frames++; @@ -651,12 +653,16 @@ static int can_rcv(struct sk_buff *skb, struct net_device *dev, struct can_frame *cf = (struct can_frame *)skb->data; int matches; - if (dev->type != ARPHRD_CAN || !net_eq(dev_net(dev), &init_net)) { - kfree_skb(skb); - return 0; - } + if (!net_eq(dev_net(dev), &init_net)) + goto drop; - BUG_ON(skb->len != sizeof(struct can_frame) || cf->can_dlc > 8); + if (WARN_ONCE(dev->type != ARPHRD_CAN || + skb->len != sizeof(struct can_frame) || + cf->can_dlc > 8, + "PF_CAN: dropped non conform skbuf: " + "dev type %d, len %d, can_dlc %d\n", + dev->type, skb->len, cf->can_dlc)) + goto drop; /* update statistics */ can_stats.rx_frames++; @@ -682,7 +688,11 @@ static int can_rcv(struct sk_buff *skb, struct net_device *dev, can_stats.matches_delta++; } - return 0; + return NET_RX_SUCCESS; + +drop: + kfree_skb(skb); + return NET_RX_DROP; } /* |