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Message-ID: <CAM0EoMneGBL0OkRC_if5VEax-XXXnFAwtpij1J3kOq9NbEPmrA@mail.gmail.com> Date: Sat, 5 Jul 2025 09:59:19 -0400 From: Jamal Hadi Salim <jhs@...atatu.com> To: Cong Wang <xiyou.wangcong@...il.com> Cc: Lizhi Xu <lizhi.xu@...driver.com>, davem@...emloft.net, edumazet@...gle.com, horms@...nel.org, jiri@...nulli.us, kuba@...nel.org, linux-kernel@...r.kernel.org, netdev@...r.kernel.org, pabeni@...hat.com, syzkaller-bugs@...glegroups.com Subject: Re: [PATCH V2] net/sched: Prevent notify to parent who unsupport class ops On Sat, Jul 5, 2025 at 1:07 AM Cong Wang <xiyou.wangcong@...il.com> wrote: > > Hi Lizhi, > > On Sat, Jul 05, 2025 at 09:18:22AM +0800, Lizhi Xu wrote: > > If the parent qdisc does not support class operations then exit notify. > > > > In addition, the validity of the cl value is judged before executing the > > notify. Similarly, the notify is exited when the address represented by > > its value is invalid. > > > > Reported-by: syzbot+1261670bbdefc5485a06@...kaller.appspotmail.com > > Closes: https://syzkaller.appspot.com/bug?extid=1261670bbdefc5485a06 > > Maybe I didn't make it clear, I think Victor's patch also fixes this > bug. > > https://lore.kernel.org/netdev/20250704163422.160424-1-victor@mojatatu.com/ > > Can you check if you still see the crash with his fix? > syzbot+1261670bbdefc5485a06@...kaller.appspotmail.com (in this report) is part of what Victor's patch fixes (as listed in that patch). cheers, jamal > The reason why I am asking is because his fix addresses a problem > earlier on the code path, which possibly makes your fix unnecessary. > Hence, his fix is closer to the root cause. > > Please test and confirm. > V > Thanks!
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