From: Hillf Danton <hdanton@sina.com>
To: syzbot <syzbot+1261670bbdefc5485a06@syzkaller.appspotmail.com>
Cc: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com
Subject: Re: [syzbot] [net?] general protection fault in qdisc_tree_reduce_backlog
Date: Fri, 4 Jul 2025 15:25:03 +0800 [thread overview]
Message-ID: <20250704072511.2387-1-hdanton@sina.com> (raw)
In-Reply-To: <686764a5.a00a0220.c7b3.0013.GAE@google.com>
> Date: Thu, 03 Jul 2025 22:20:37 -0700
> syzbot found the following issue on:
>
> HEAD commit: bd475eeaaf3c Merge branch '200GbE' of git://git.kernel.org..
> git tree: net
> console+strace: https://syzkaller.appspot.com/x/log.txt?x=12f0b3d4580000
> kernel config: https://syzkaller.appspot.com/x/.config?x=36b0e72cad5298f8
> dashboard link: https://syzkaller.appspot.com/bug?extid=1261670bbdefc5485a06
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=164d8c8c580000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14839ebc580000
#syz test
--- x/net/sched/sch_api.c
+++ y/net/sched/sch_api.c
@@ -803,7 +803,7 @@ void qdisc_tree_reduce_backlog(struct Qd
break;
}
cops = sch->ops->cl_ops;
- if (notify && cops->qlen_notify) {
+ if (notify && cops && cops->qlen_notify) {
/* Note that qlen_notify must be idempotent as it may get called
* multiple times.
*/
--
next prev parent reply other threads:[~2025-07-04 7:25 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-07-04 5:20 syzbot
2025-07-04 6:36 ` syzbot
2025-07-04 7:25 ` Hillf Danton [this message]
2025-07-04 7:53 ` syzbot
2025-07-04 8:04 ` [PATCH] net/sched: Prevent notify to parent who unsupport class ops Lizhi Xu
2025-07-04 14:01 ` Paolo Abeni
2025-07-05 0:03 ` Cong Wang
2025-07-05 1:18 ` [PATCH V2] " Lizhi Xu
2025-07-05 5:07 ` Cong Wang
2025-07-05 13:59 ` Jamal Hadi Salim
2025-07-04 8:34 ` [syzbot] [net?] general protection fault in qdisc_tree_reduce_backlog syzbot
2025-07-05 8:42 ` Hillf Danton
2025-07-05 9:12 ` syzbot
[not found] <20250704063547.3973319-1-lizhi.xu@windriver.com>
2025-07-04 7:30 ` syzbot
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