linux-kernel - Re: [PATCH] of: unittest: Fix out of bounds array access when id

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Message-ID: <CAL_JsqLtQanbiC4egB8d5quQRZNq0V6q2s+=qhBeypBqLH-pgA@mail.gmail.com>
Date:   Tue, 21 Dec 2021 07:20:53 -0400
From:   Rob Herring <robh+dt@...nel.org>
To:     Yin Xiujiang <yinxiujiang@...inos.cn>
Cc:     frowand.list@...il.com, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] of: unittest: Fix out of bounds array access when id < 0

On Tue, Dec 21, 2021 at 5:34 AM Yin Xiujiang <yinxiujiang@...inos.cn> wrote:
>
> In of_unittest_untrack_overlay if id is less than 0 then
> overlay_id_bits will be out of bounds. And it is also mentioned
> in bugzilla as a bug report:
> https://bugzilla.kernel.org/show_bug.cgi?id=214867
>
> Fix this bug by tiggering WARN_ON()

If id shouldn't be less than 0, can we make it unsigned instead as
discussed here[1].

Rob

[1] https://lore.kernel.org/all/c474a371-b524-1da8-4a67-e72cf8f2b0f7@gmail.com/