From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from out2-smtp.messagingengine.com ([66.111.4.26]:37679 "EHLO out2-smtp.messagingengine.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754913AbeATQdv (ORCPT ); Sat, 20 Jan 2018 11:33:51 -0500 Subject: FAILED: patch "[PATCH] can: af_can: can_rcv(): replace WARN_ONCE by pr_warn_once" failed to apply to 4.9-stable tree To: mkl@pengutronix.de, dvyukov@google.com, socketcan@hartkopp.net, stable@vger.kernel.org Cc: From: Date: Sat, 20 Jan 2018 17:33:48 +0100 Message-ID: <151646602840180@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: The patch below does not apply to the 4.9-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >>From 8cb68751c115d176ec851ca56ecfbb411568c9e8 Mon Sep 17 00:00:00 2001 From: Marc Kleine-Budde Date: Tue, 16 Jan 2018 19:30:14 +0100 Subject: [PATCH] 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 Acked-by: Oliver Hartkopp Cc: linux-stable Signed-off-by: Marc Kleine-Budde 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,