netdev - Re: [PATCH 5.4 096/156] net: sched: sch: Bounds check priority

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Date:   Tue, 21 Feb 2023 08:45:18 +0100
From:   Paolo Abeni <pabeni@...hat.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org
Cc:     patches@...ts.linux.dev, Jamal Hadi Salim <jhs@...atatu.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Jiri Pirko <jiri@...nulli.us>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        Kees Cook <keescook@...omium.org>,
        Simon Horman <simon.horman@...igine.com>,
        Cong Wang <cong.wang@...edance.com>,
        Sasha Levin <sashal@...nel.org>
Subject: Re: [PATCH 5.4 096/156] net: sched: sch: Bounds check priority

Hello,

On Mon, 2023-02-20 at 14:35 +0100, Greg Kroah-Hartman wrote:
> From: Kees Cook <keescook@...omium.org>
> 
> [ Upstream commit de5ca4c3852f896cacac2bf259597aab5e17d9e3 ]
> 
> Nothing was explicitly bounds checking the priority index used to access
> clpriop[]. WARN and bail out early if it's pathological. Seen with GCC 13:
> 
> ../net/sched/sch_htb.c: In function 'htb_activate_prios':
> ../net/sched/sch_htb.c:437:44: warning: array subscript [0, 31] is outside array bounds of 'struct htb_prio[8]' [-Warray-bounds=]
>   437 |                         if (p->inner.clprio[prio].feed.rb_node)
>       |                             ~~~~~~~~~~~~~~~^~~~~~
> ../net/sched/sch_htb.c:131:41: note: while referencing 'clprio'
>   131 |                         struct htb_prio clprio[TC_HTB_NUMPRIO];
>       |                                         ^~~~~~
> 
> Cc: Jamal Hadi Salim <jhs@...atatu.com>
> Cc: Cong Wang <xiyou.wangcong@...il.com>
> Cc: Jiri Pirko <jiri@...nulli.us>
> Cc: "David S. Miller" <davem@...emloft.net>
> Cc: Eric Dumazet <edumazet@...gle.com>
> Cc: Jakub Kicinski <kuba@...nel.org>
> Cc: Paolo Abeni <pabeni@...hat.com>
> Cc: netdev@...r.kernel.org
> Signed-off-by: Kees Cook <keescook@...omium.org>
> Reviewed-by: Simon Horman <simon.horman@...igine.com>
> Reviewed-by: Cong Wang <cong.wang@...edance.com>
> Link: https://lore.kernel.org/r/20230127224036.never.561-kees@kernel.org
> Signed-off-by: Paolo Abeni <pabeni@...hat.com>
> Signed-off-by: Sasha Levin <sashal@...nel.org>

This one has a follow-up which I don't see among the patches reaching
the netdev ML:

commit 9cec2aaffe969f2a3e18b5ec105fc20bb908e475
Author: Dan Carpenter <error27@...il.com>
Date:   Mon Feb 6 16:18:32 2023 +0300

    net: sched: sch: Fix off by one in htb_activate_prios()

Cheers,

Paolo