linux-kernel - Re: [syzbot] [net?] WARNING in sk_skb_reason

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Message-Id: <20241117000154.1285-1-hdanton@sina.com>
Date: Sun, 17 Nov 2024 08:01:54 +0800
From: Hillf Danton <hdanton@...a.com>
To: syzbot <syzbot+52fbd90f020788ec7709@...kaller.appspotmail.com>
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [net?] WARNING in sk_skb_reason_drop

On Sat, 16 Nov 2024 10:32:25 -0800
> syzbot found the following issue on:
> 
> HEAD commit:    a58f00ed24b8 net: sched: cls_api: improve the error messag..
> git tree:       net-next
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=14f481a7980000

#syz test

--- x/net/ipv4/route.c
+++ y/net/ipv4/route.c
@@ -2478,7 +2478,7 @@ ip_route_input_rcu(struct sk_buff *skb,
 		int our = 0;
 
 		if (!in_dev)
-			return -EINVAL;
+			return reason;
 		our = ip_check_mc_rcu(in_dev, daddr, saddr,
 				      ip_hdr(skb)->protocol);
 
--