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* [PATCH 1/2] can: af_can: can_rcv(): replace WARN_ONCE by pr_warn_once
@ 2018-01-16 18:42 Marc Kleine-Budde
  2018-01-16 18:42 ` [PATCH 2/2] can: af_can: canfd_rcv(): " Marc Kleine-Budde
  0 siblings, 1 reply; 3+ messages in thread
From: Marc Kleine-Budde @ 2018-01-16 18:42 UTC (permalink / raw)
  To: linux-can; +Cc: syzkaller-bugs, Marc Kleine-Budde, linux-stable

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>
Cc: linux-stable <stable@vger.kernel.org>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 net/can/af_can.c | 18 +++++++-----------
 1 file 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,
-- 
2.15.1


^ permalink raw reply related	[flat|nested] 3+ messages in thread
* [PATCH 2/2] can: af_can: canfd_rcv(): replace WARN_ONCE by pr_warn_once
  2018-01-16 18:42 [PATCH 1/2] can: af_can: can_rcv(): replace WARN_ONCE by pr_warn_once Marc Kleine-Budde
@ 2018-01-16 18:42 ` Marc Kleine-Budde
  0 siblings, 0 replies; 3+ messages in thread
From: Marc Kleine-Budde @ 2018-01-16 18:42 UTC (permalink / raw)
  To: linux-can; +Cc: syzkaller-bugs, Marc Kleine-Budde, linux-stable

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>
Cc: linux-stable <stable@vger.kernel.org>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 net/can/af_can.c | 18 +++++++-----------
 1 file changed, 7 insertions(+), 11 deletions(-)

diff --git a/net/can/af_can.c b/net/can/af_can.c
index ae835382e678..4d7f988a3130 100644
--- a/net/can/af_can.c
+++ b/net/can/af_can.c
@@ -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;
 
-	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;
 }
 
 /*
-- 
2.15.1

^ permalink raw reply related	[flat|nested] 3+ messages in thread
* [PATCH 2/2] can: af_can: canfd_rcv(): replace WARN_ONCE by pr_warn_once
  2018-01-18 10:15 pull-request: can 2018-01-18 Marc Kleine-Budde
@ 2018-01-18 10:15 ` Marc Kleine-Budde
  0 siblings, 0 replies; 3+ messages in thread
From: Marc Kleine-Budde @ 2018-01-18 10:15 UTC (permalink / raw)
  To: netdev; +Cc: davem, linux-can, kernel, Marc Kleine-Budde, linux-stable

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>
---
 net/can/af_can.c | 18 +++++++-----------
 1 file changed, 7 insertions(+), 11 deletions(-)

diff --git a/net/can/af_can.c b/net/can/af_can.c
index ae835382e678..4d7f988a3130 100644
--- a/net/can/af_can.c
+++ b/net/can/af_can.c
@@ -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;
 
-	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;
 }
 
 /*
-- 
2.15.1


^ permalink raw reply related	[flat|nested] 3+ messages in thread
end of thread, other threads:[~2018-01-18 10:15 UTC | newest]

Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2018-01-16 18:42 [PATCH 1/2] can: af_can: can_rcv(): replace WARN_ONCE by pr_warn_once Marc Kleine-Budde
2018-01-16 18:42 ` [PATCH 2/2] can: af_can: canfd_rcv(): " Marc Kleine-Budde
2018-01-18 10:15 pull-request: can 2018-01-18 Marc Kleine-Budde
2018-01-18 10:15 ` [PATCH 2/2] can: af_can: canfd_rcv(): replace WARN_ONCE by pr_warn_once Marc Kleine-Budde

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