linux-kernel - Re: [syzbot] [can?] WARNING: refcount bug in sk_skb_reason

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20241003233452.2044-1-hdanton@sina.com>
Date: Fri,  4 Oct 2024 07:34:52 +0800
From: Hillf Danton <hdanton@...a.com>
To: syzbot <syzbot+d4e8dc385d9258220c31@...kaller.appspotmail.com>
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [can?] WARNING: refcount bug in sk_skb_reason_drop

On Thu, 03 Oct 2024 09:14:26 -0700
> syzbot found the following issue on:
> 
> HEAD commit:    a430d95c5efa Merge tag 'lsm-pr-20240911' of git://git.kern..
> git tree:       upstream
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=15b9a607980000

#syz test

--- x/net/can/j1939/transport.c
+++ y/net/can/j1939/transport.c
@@ -1506,6 +1506,7 @@ static struct j1939_session *j1939_sessi
 
 	skb_queue_head_init(&session->skb_queue);
 	skb_queue_tail(&session->skb_queue, skb);
+	skb_get(skb);
 
 	skcb = j1939_skb_to_cb(skb);
 	memcpy(&session->skcb, skcb, sizeof(session->skcb));
--