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| author | Marc Kleine-Budde <mkl@pengutronix.de> | 2018-01-16 19:30:14 +0100 |
|---|---|---|
| committer | Marc Kleine-Budde <mkl@pengutronix.de> | 2018-01-18 09:32:54 +0100 |
| commit | 8cb68751c115d176ec851ca56ecfbb411568c9e8 (patch) | |
| tree | 08b081492436174f37a8fe3d3c9fa8c2f9e47a76 | |
| parent | ad9294dbc227cbc8e173b3b963e7dd9af5314f77 (diff) | |
| download | linux-stable-8cb68751c115d176ec851ca56ecfbb411568c9e8.tar.gz linux-stable-8cb68751c115d176ec851ca56ecfbb411568c9e8.tar.bz2 linux-stable-8cb68751c115d176ec851ca56ecfbb411568c9e8.zip | |
can: af_can: can_rcv(): replace WARN_ONCE by pr_warn_once
If an invalid CAN 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+4386709c0c1284dca827@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>
| -rw-r--r-- | net/can/af_can.c | 18 |
1 files changed, 7 insertions, 11 deletions
diff --git a/net/can/af_can.c b/net/can/af_can.c index 003b2d6d655f..ae835382e678 100644 --- a/net/can/af_can.c +++ b/net/can/af_can.c @@ -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, |