linux-kernel - Re: [PATCH 1/2] gpiolib: Fix NULL pointer deference

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Message-ID: <CACRpkdZ42659nZnKaahFDahLY1Ey4dtTGt2nY69se=pu=jnpFw@mail.gmail.com>
Date:	Wed, 8 Jun 2016 10:39:30 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>,
	Grygorii Strashko <grygorii.strashko@...com>,
	Roger Quadros <rogerq@...com>
Cc:	Alexandre Courbot <gnurou@...il.com>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] gpiolib: Fix NULL pointer deference

On Fri, Jun 3, 2016 at 7:10 PM, Ricardo Ribalda Delgado
<ricardo.ribalda@...il.com> wrote:

> Under some circumstances, a gpiochip might be half cleaned from the
> gpio_device list.
>
> This patch makes sure that the chip pointer is still valid, before
> calling the match function.
>
> [  104.088296] BUG: unable to handle kernel NULL pointer dereference at
> 0000000000000090
> [  104.089772] IP: [<ffffffff813d2045>] of_gpiochip_find_and_xlate+0x15/0x80
> [  104.128273] Call Trace:
> [  104.129802]  [<ffffffff813d2030>] ? of_parse_own_gpio+0x1f0/0x1f0
> [  104.131353]  [<ffffffff813cd910>] gpiochip_find+0x60/0x90
> [  104.132868]  [<ffffffff813d21ba>] of_get_named_gpiod_flags+0x9a/0x120
> ...
> [  104.141586]  [<ffffffff8163d12b>] gpio_led_probe+0x11b/0x360
>
> Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>

Oh there is the fix that Roger and Grygorii needs.

Applied to fixes and tagged for stable.

Sorry for screwing things up :(

Yours,
Linus Walleij