linux-kernel - Re: [PATCH] pinctrl: sunxi: Correct number of IRQ banks on H6 main pin controller

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Date:   Mon, 21 Jan 2019 14:41:31 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Chen-Yu Tsai <wens@...e.org>
Cc:     Maxime Ripard <maxime.ripard@...tlin.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>,
        stable <stable@...r.kernel.org>
Subject: Re: [PATCH] pinctrl: sunxi: Correct number of IRQ banks on H6 main
 pin controller

On Tue, Jan 15, 2019 at 3:45 AM Chen-Yu Tsai <wens@...e.org> wrote:

> The H6 main pin controller has four banks of interrupt-triggering pins.
> The driver as originally submitted only specified three, but had pin
> descriptions referencing a fourth bank. This results in a out-of-bounds
> access into .irq_array of struct sunxi_pinctrl. This however did not
> result in a crash until v4.20, with commit a66d972465d1 ("devres: Align
> data[] to ARCH_KMALLOC_MINALIGN"), which changed the alignment of memory
> region returned by devm_kcalloc(). The increase likely moved the
> out-of-bounds access into the next, unmapped page.

Nice work rootcausing this!

Patch applied for fixes with the tested-by and ACK.

Yours,
Linus Walleij