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>

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,