linux-kernel - Re: [PATCH] pinctrl: microchip: fix array overflow

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Date:   Tue, 30 Mar 2021 11:04:50 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Lars Povlsen <lars.povlsen@...rochip.com>
Cc:     Arnd Bergmann <arnd@...nel.org>,
        Steen Hegelund <Steen.Hegelund@...rochip.com>,
        Microchip Linux Driver Support <UNGLinuxDriver@...rochip.com>,
        Arnd Bergmann <arnd@...db.de>, Zou Wei <zou_wei@...wei.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Gustavo A . R . Silva" <gustavoars@...nel.org>
Subject: Re: [PATCH] pinctrl: microchip: fix array overflow

On Sun, Mar 28, 2021 at 7:18 PM Lars Povlsen <lars.povlsen@...rochip.com> wrote:
> Linus Walleij writes:
>
> > On Tue, Mar 23, 2021 at 2:10 PM Arnd Bergmann <arnd@...nel.org> wrote:
> >
> >> From: Arnd Bergmann <arnd@...db.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@...db.de>
> >
> > Patch applied.
> >
> > Yours,
> > Linus Walleij
>
> I don't understand - I submitted a fix for this already in February
> (reported by Gustavo). It took some time for you to get it ack'ed - but
> you did (Feb 1st).
>
> Did it end up getting dropped?

No I ended up with your fix in fixes, then forgot about it and applied
Arnds fix to devel (for-next) and ended up getting a conflict in my
face.

Last night I rebased devel, dropped Arnds patch and thus solved
the conflict.

Yours,
Linus Walleij