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From:   Linus Walleij <linus.walleij@linaro.org>
Date:   Thu, 25 Mar 2021 10:26:24 +0100
Message-ID: <CACRpkdZjh+z66XAxg4-Cj_Mz7iVkgpyY65nNTvUdOXV6yTknEQ@mail.gmail.com>
Subject: Re: [PATCH] pinctrl: microchip: fix array overflow
To:     Arnd Bergmann <arnd@kernel.org>
Cc:     Lars Povlsen <lars.povlsen@microchip.com>,
        Steen Hegelund <Steen.Hegelund@microchip.com>,
        Microchip Linux Driver Support <UNGLinuxDriver@microchip.com>,
        Arnd Bergmann <arnd@arndb.de>, Zou Wei <zou_wei@huawei.com>,
        Linux ARM <linux-arm-kernel@lists.infradead.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
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On Tue, Mar 23, 2021 at 2:10 PM Arnd Bergmann <arnd@kernel.org> wrote:

> From: Arnd Bergmann <arnd@arndb.de>
>
> Building with 'make W=1' shows an array overflow:
>
> drivers/pinctrl/pinctrl-microchip-sgpio.c: In function 'microchip_sgpio_irq_settype':
> drivers/pinctrl/pinctrl-microchip-sgpio.c:154:39: error: array subscript 10 is above array bounds of 'const u8[10]' {aka 'const unsigned char[10]'} [-Werror=array-bounds]
>   154 |  u32 regoff = priv->properties->regoff[rno] + off;
>       |               ~~~~~~~~~~~~~~~~~~~~~~~~^~~~~
> drivers/pinctrl/pinctrl-microchip-sgpio.c:55:5: note: while referencing 'regoff'
>    55 |  u8 regoff[MAXREG];
>       |     ^~~~~~
>
> It's not clear to me what was meant here, my best guess is that the
> offset should have been applied to the third argument instead of the
> second.
>
> Fixes: be2dc859abd4 ("pinctrl: pinctrl-microchip-sgpio: Add irq support (for sparx5)")
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>

Patch applied.

Yours,
Linus Walleij