linux-kernel - Re: powerpc: sysdev: simple_gpio: fix Oops in gpio save

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Date:   Thu,  1 Jun 2017 23:31:08 +1000 (AEST)
From:   Michael Ellerman <patch-notifications@...erman.id.au>
To:     Christophe Leroy <christophe.leroy@....fr>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Scott Wood <oss@...error.net>,
        Linus Walleij <linus.walleij@...aro.org>
Cc:     linux-gpio@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: powerpc: sysdev: simple_gpio: fix Oops in gpio save_regs function

On Wed, 2017-05-24 at 08:01:55 UTC, Christophe Leroy wrote:
> of_mm_gpiochip_add_data() generates an Oops for NULL pointer dereference.
> 
> of_mm_gpiochip_add_data() calls mm_gc->save_regs() before
> setting the data, therefore ->save_regs() cannot use gpiochip_get_data()
> 
> Fixes: 937daafca774b ("powerpc: simple-gpio: use gpiochip data pointer")
> Cc: stable@...r.kernel.org
> 
> Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
> Reviewed-by: Linus Walleij <linus.walleij@...aro.org>

Applied to powerpc fixes, thanks.

https://git.kernel.org/powerpc/c/6f553912eedafae13ff20b322a65e4

cheers