linux-kernel - Re: [PATCH] PM: domains: fix integer overflow issues in genpd_parse

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Message-ID: <CAJZ5v0gx7bD9EZKPQWyAAZ6hSKjK4hr-nkrJu84HEK-g2AMAaw@mail.gmail.com>
Date:   Wed, 24 May 2023 18:38:40 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Ulf Hansson <ulf.hansson@...aro.org>
Cc:     Nikita Zhandarovich <n.zhandarovich@...tech.ru>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Kevin Hilman <khilman@...nel.org>,
        Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        lvc-project@...uxtesting.org
Subject: Re: [PATCH] PM: domains: fix integer overflow issues in genpd_parse_state()

On Mon, May 8, 2023 at 12:37 PM Ulf Hansson <ulf.hansson@...aro.org> wrote:
>
> On Tue, 18 Apr 2023 at 15:07, Nikita Zhandarovich
> <n.zhandarovich@...tech.ru> wrote:
> >
> > Currently, while calculating residency and latency values, right
> > operands may overflow if resulting values are big enough.
> >
> > To prevent this, albeit unlikely case, play it safe and convert
> > right operands to left ones' type s64.
> >
> > Found by Linux Verification Center (linuxtesting.org) with static
> > analysis tool SVACE.
> >
> > Fixes: 30f604283e05 ("PM / Domains: Allow domain power states to be read from DT")
> > Signed-off-by: Nikita Zhandarovich <n.zhandarovich@...tech.ru>
>
> Acked-by: Ulf Hansson <ulf.hansson@...aro.org>

Applied as 6.5 material, thanks!

And sorry for the delay.