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can: af_can: canfd_rcv(): replace WARN_ONCE by pr_warn_once

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If an invalid CANFD frame is received, from a driver or from a tun
interface, a Kernel warning is generated.

This patch replaces the WARN_ONCE by a simple pr_warn_once, so that a
kernel, bootet with panic_on_warn, does not panic. A printk seems to be
more appropriate here.

Reported-by: syzbot+e3b775f40babeff6e68b@syzkaller.appspotmail.com
Suggested-by: Dmitry Vyukov <dvyukov@google.com>
Acked-by: Oliver Hartkopp <socketcan@hartkopp.net>
Cc: linux-stable <stable@vger.kernel.org>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Marc Kleine-Budde 2018-01-16 19:30:14 +01:00
parent 8cb68751c1
commit d468984688
1 changed files with 7 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
net/can/af_can.c
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@ -738,20 +738,16 @@ static int canfd_rcv(struct sk_buff *skb, struct net_device *dev,
{ {
struct canfd_frame *cfd = (struct canfd_frame *)skb->data; struct canfd_frame *cfd = (struct canfd_frame *)skb->data;
if (WARN_ONCE(dev->type != ARPHRD_CAN || if (unlikely(dev->type != ARPHRD_CAN || skb->len != CANFD_MTU ||
skb->len != CANFD_MTU || cfd->len > CANFD_MAX_DLEN)) {
cfd->len > CANFD_MAX_DLEN, pr_warn_once("PF_CAN: dropped non conform CAN FD skbuf: dev type %d, len %d, datalen %d\n",
"PF_CAN: dropped non conform CAN FD skbuf: " dev->type, skb->len, cfd->len);
"dev type %d, len %d, datalen %d\n", kfree_skb(skb);
dev->type, skb->len, cfd->len)) return NET_RX_DROP;
goto drop; }
can_receive(skb, dev); can_receive(skb, dev);
return NET_RX_SUCCESS; return NET_RX_SUCCESS;
drop:
kfree_skb(skb);
return NET_RX_DROP;
} }
/* /*