From: Petr Machata <petrm@nvidia•com>
To: Davide Caratti <dcaratti@redhat•com>
Cc: Jamal Hadi Salim <jhs@mojatatu•com>,
Cong Wang <xiyou.wangcong@gmail•com>,
Jiri Pirko <jiri@resnulli•us>,
"David S. Miller" <davem@davemloft•net>,
"Eric Dumazet" <edumazet@google•com>,
Jakub Kicinski <kuba@kernel•org>,
"Paolo Abeni" <pabeni@redhat•com>,
Simon Horman <horms@kernel•org>,
Petr Machata <petrm@mellanox•com>,
Ido Schimmel <idosch@mellanox•com>, <netdev@vger•kernel.org>
Subject: Re: [PATCH net] net/sched: ets: fix divide by zero in the offload path
Date: Wed, 25 Feb 2026 18:23:13 +0100 [thread overview]
Message-ID: <87tsv4g2jk.fsf@nvidia.com> (raw)
In-Reply-To: <28504887df314588c7255e9911769c36f751edee.1771964872.git.dcaratti@redhat.com>
Davide Caratti <dcaratti@redhat•com> writes:
> Offloading ETS requires computing each class' WRR weight: this is done by
> averaging over the sums of quanta as 'q_sum' and 'q_psum'. Using unsigned
> int, the same integer size as the individual DRR quanta, can overflow and
> even cause division by zero, like it happened in the following splat:
...
> Fix this using 64-bit integers for 'q_sum' and 'q_psum'.
>
> Cc: stable@vger•kernel.org
> Fixes: d35eb52bd2ac ("net: sch_ets: Make the ETS qdisc offloadable")
> Signed-off-by: Davide Caratti <dcaratti@redhat•com>
Thanks for the fix!
Reviewed-by: Petr Machata <petrm@nvidia•com>
next prev parent reply other threads:[~2026-02-25 17:24 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-02-24 20:28 [PATCH net] net/sched: ets: fix divide by zero in the offload path Davide Caratti
2026-02-25 13:45 ` Jamal Hadi Salim
2026-02-25 14:04 ` Davide Caratti
2026-02-25 17:37 ` Jamal Hadi Salim
2026-02-25 17:23 ` Petr Machata [this message]
2026-02-27 3:20 ` patchwork-bot+netdevbpf
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