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Commit 69c4a65e authored by David S. Miller's avatar David S. Miller
Browse files

Merge tag 'linux-can-fixes-for-4.15-20180118' of... 

Merge tag 'linux-can-fixes-for-4.15-20180118' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can



Marc Kleine-Budde says:

====================
pull-request: can 2018-01-18

====================
this is a pull reqeust of two patches for net/master:

The syzkaller project triggered two WARN_ONCE() in the af_can code from
userspace and we decided to replace it by a pr_warn_once().
====================

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parents 591ff9ea d4689846

net/can/af_can.c

+14 −22
Original line number Diff line number Diff line
@@ -721,20 +721,16 @@ static int can_rcv(struct sk_buff *skb, struct net_device *dev, 
{

	struct canfd_frame *cfd = (struct canfd_frame *)skb->data;



	if (WARN_ONCE(dev->type != ARPHRD_CAN ||

		      skb->len != CAN_MTU ||

		      cfd->len > CAN_MAX_DLEN,

		      "PF_CAN: dropped non conform CAN skbuf: "

		      "dev type %d, len %d, datalen %d\n",

		      dev->type, skb->len, cfd->len))

		goto drop;

	if (unlikely(dev->type != ARPHRD_CAN || skb->len != CAN_MTU ||

		     cfd->len > CAN_MAX_DLEN)) {

		pr_warn_once("PF_CAN: dropped non conform CAN skbuf: dev type %d, len %d, datalen %d\n",

			     dev->type, skb->len, cfd->len);

		kfree_skb(skb);

		return NET_RX_DROP;

	}



	can_receive(skb, dev);

	return NET_RX_SUCCESS;



drop:

	kfree_skb(skb);

	return NET_RX_DROP;

}



static int canfd_rcv(struct sk_buff *skb, struct net_device *dev,
@@ -742,20 +738,16 @@ static int canfd_rcv(struct sk_buff *skb, struct net_device *dev, 
{

	struct canfd_frame *cfd = (struct canfd_frame *)skb->data;



	if (WARN_ONCE(dev->type != ARPHRD_CAN ||

		      skb->len != CANFD_MTU ||

		      cfd->len > CANFD_MAX_DLEN,

		      "PF_CAN: dropped non conform CAN FD skbuf: "

		      "dev type %d, len %d, datalen %d\n",

		      dev->type, skb->len, cfd->len))

		goto drop;

	if (unlikely(dev->type != ARPHRD_CAN || skb->len != CANFD_MTU ||

		     cfd->len > CANFD_MAX_DLEN)) {

		pr_warn_once("PF_CAN: dropped non conform CAN FD skbuf: dev type %d, len %d, datalen %d\n",

			     dev->type, skb->len, cfd->len);

		kfree_skb(skb);

		return NET_RX_DROP;

	}



	can_receive(skb, dev);

	return NET_RX_SUCCESS;



drop:

	kfree_skb(skb);

	return NET_RX_DROP;

}



/*