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

[Linus Walleij <linus.walleij@xxxxxxxxxx>]

On Tue, Jan 15, 2019 at 3:45 AM Chen-Yu Tsai <wens@xxxxxxxx> 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