linux-kernel - Re: [syzbot] [net?] general protection fault in drr_qlen

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: Windows password security audit tool. GUI, reports in PDF.

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

Message-ID: <686775c7.a70a0220.29cf51.0010.GAE@google.com>
Date: Thu, 03 Jul 2025 23:33:43 -0700
From: syzbot <syzbot+15b96fc3aac35468fe77@...kaller.appspotmail.com>
To: linux-kernel@...r.kernel.org
Subject: Re: [syzbot] [net?] general protection fault in drr_qlen_notify

For archival purposes, forwarding an incoming command email to
linux-kernel@...r.kernel.org.

***

Subject: Re: [syzbot] [net?] general protection fault in drr_qlen_notify
Author: lizhi.xu@...driver.com

#syz test

diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c
index c5e3673aadbe..c4ca8f3b820b 100644
--- a/net/sched/sch_api.c
+++ b/net/sched/sch_api.c
@@ -817,7 +817,8 @@ void qdisc_tree_reduce_backlog(struct Qdisc *sch, int n, int len)
 		cops = sch->ops->cl_ops;
 		if (notify && cops->qlen_notify) {
 			cl = cops->find(sch, parentid);
-			cops->qlen_notify(sch, cl);
+			if (virt_addr_valid(cl))
+				cops->qlen_notify(sch, cl);
 		}
 		sch->q.qlen -= n;
 		sch->qstats.backlog -= len;