netdev - Re: [PATCH net] net/sched: sch_fq: fix integer overflow of "credit"

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Date:   Tue, 18 Apr 2023 12:26:13 +0200
From:   Eric Dumazet <edumazet@...gle.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     Davide Caratti <dcaratti@...hat.com>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Jiri Pirko <jiri@...nulli.us>,
        Christoph Paasch <cpaasch@...le.com>, netdev@...r.kernel.org
Subject: Re: [PATCH net] net/sched: sch_fq: fix integer overflow of "credit"

On Tue, Apr 18, 2023 at 4:30 AM Jakub Kicinski <kuba@...nel.org> wrote:
>
> On Mon, 17 Apr 2023 13:02:40 +0200 Davide Caratti wrote:
> > +             u32 initial_quantum = nla_get_u32(tb[TCA_FQ_INITIAL_QUANTUM]);
> > +
> > +             if (initial_quantum <= INT_MAX) {
> > +                     q->initial_quantum = initial_quantum;
> > +             } else {
> > +                     NL_SET_ERR_MSG_MOD(extack, "invalid initial quantum");
> > +                     err = -EINVAL;
> > +             }
>
> Please set the right policy in fq_policy[] instead.

Not sure these policies are available for old kernels (sch_fq was
added in linux-3.12) ?

Or have we backported all this infra already on stable kernels ?

commit d06a09b94c618c96ced584dd4611a888c8856b8d
Author: Johannes Berg <johannes.berg@...el.com>
Date:   Thu Apr 30 22:13:08 2020 +0200

    netlink: extend policy range validation