From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alexandre Belloni Subject: Re: [PATCH] pwm: sun4i: fix a possible NULL dereference Date: Thu, 12 Nov 2015 15:47:01 +0100 Message-ID: <20151112144701.GD4230@piout.net> References: <1447314132-29458-1-git-send-email-clabbe.montjoie@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from down.free-electrons.com ([37.187.137.238]:48249 "EHLO mail.free-electrons.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752821AbbKLOrE (ORCPT ); Thu, 12 Nov 2015 09:47:04 -0500 Content-Disposition: inline In-Reply-To: <1447314132-29458-1-git-send-email-clabbe.montjoie@gmail.com> Sender: linux-pwm-owner@vger.kernel.org List-Id: linux-pwm@vger.kernel.org To: LABBE Corentin Cc: linux-arm-kernel@lists.infradead.org, maxime.ripard@free-electrons.com, thierry.reding@gmail.com, wens@csie.org, linux-pwm@vger.kernel.org, linux-kernel@vger.kernel.org Hi, On 12/11/2015 at 08:42:12 +0100, LABBE Corentin wrote : > of_match_device could return NULL, and so cause a NULL pointer > dereference later. > > Reported-by: coverity (CID 1324139) > Signed-off-by: LABBE Corentin > --- > drivers/pwm/pwm-sun4i.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/drivers/pwm/pwm-sun4i.c b/drivers/pwm/pwm-sun4i.c > index cd9dde5..3011fcc 100644 > --- a/drivers/pwm/pwm-sun4i.c > +++ b/drivers/pwm/pwm-sun4i.c > @@ -291,6 +291,8 @@ static int sun4i_pwm_probe(struct platform_device *pdev) > const struct of_device_id *match; > > match = of_match_device(sun4i_pwm_dt_ids, &pdev->dev); > + if (!match) > + return -ENODEV; > This will never happen. If it is not matching, then sun4i_pwm_probe is not called. -- Alexandre Belloni, Free Electrons Embedded Linux, Kernel and Android engineering http://free-electrons.com