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@csie.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