Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752017AbdLMJU6 convert rfc822-to-8bit (ORCPT ); Wed, 13 Dec 2017 04:20:58 -0500 Received: from mail.free-electrons.com ([62.4.15.54]:56288 "EHLO mail.free-electrons.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751507AbdLMJU4 (ORCPT ); Wed, 13 Dec 2017 04:20:56 -0500 Date: Wed, 13 Dec 2017 10:20:48 +0100 From: Mylene JOSSERAND To: Quentin Schulz Cc: linus.walleij@linaro.org, wens@csie.org, maxime.ripard@free-electrons.com, linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org, thomas.petazzoni@free-electrons.com, linux-sunxi@googlegroups.com Subject: Re: [PATCH] pinctrl: axp209: dereference pointer after it's been set Message-ID: <20171213102048.1c7e3b7f@dell-desktop.home> In-Reply-To: <20171213085503.31899-1-quentin.schulz@free-electrons.com> References: <20171213085503.31899-1-quentin.schulz@free-electrons.com> Organization: Free Electrons X-Mailer: Claws Mail 3.14.1 (GTK+ 2.24.31; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1559 Lines: 48 Hello Quentin, Le Wed, 13 Dec 2017 09:55:03 +0100, Quentin Schulz a écrit : > The number of GPIOs is gotten from a field within the structure > referenced in the of_device.data but it was actually read before it was > retrieved, thus it was dereferencing a null pointer. > > Set the number of GPIOs after retrieving of_device.data. > > Fixes: e1190083b89b ("pinctrl: axp209: add support for AXP813 GPIOs") > > Signed-off-by: Quentin Schulz > Reported-by: Mylène Josserand Tested-by: Mylène Josserand Thanks, Mylène > --- > drivers/pinctrl/pinctrl-axp209.c | 4 +++- > 1 file changed, 3 insertions(+), 1 deletion(-) > > diff --git a/drivers/pinctrl/pinctrl-axp209.c b/drivers/pinctrl/pinctrl-axp209.c > index 22d3bb0bf927..510a2821e910 100644 > --- a/drivers/pinctrl/pinctrl-axp209.c > +++ b/drivers/pinctrl/pinctrl-axp209.c > @@ -413,9 +413,11 @@ static int axp20x_pctl_probe(struct platform_device *pdev) > pctl->chip.set = axp20x_gpio_set; > pctl->chip.direction_input = axp20x_gpio_input; > pctl->chip.direction_output = axp20x_gpio_output; > - pctl->chip.ngpio = pctl->desc->npins; > > pctl->desc = (struct axp20x_pctrl_desc *)of_device_get_match_data(dev); > + > + pctl->chip.ngpio = pctl->desc->npins; > + > pctl->regmap = axp20x->regmap; > pctl->dev = &pdev->dev; > -- Mylène Josserand, Free Electrons Embedded Linux and Kernel engineering http://free-electrons.com