From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3977DC433E0 for ; Tue, 2 Feb 2021 08:29:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DEB9C64EC3 for ; Tue, 2 Feb 2021 08:29:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231612AbhBBI3U (ORCPT ); Tue, 2 Feb 2021 03:29:20 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34678 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229850AbhBBI3R (ORCPT ); Tue, 2 Feb 2021 03:29:17 -0500 Received: from mail-wm1-x32d.google.com (mail-wm1-x32d.google.com [IPv6:2a00:1450:4864:20::32d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EB441C061573 for ; Tue, 2 Feb 2021 00:28:35 -0800 (PST) Received: by mail-wm1-x32d.google.com with SMTP id m2so1549114wmm.1 for ; Tue, 02 Feb 2021 00:28:35 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:content-transfer-encoding:in-reply-to; bh=bFiTMfrDGaWBCg0p94Ve9DO2sWATZ48G3jOzHUgim7g=; b=FBJWMelLQhMEkkiGfS95RqrQWLdNPopNfuEOE3bVIxGKfpwQzmatH39kKmkCK+R/mE ZvUxBJXkz7bdlKErQVVoxi1XU4wYu8x5Y5C3HVICYvbeLJE7qDi5AzKix0j6Dyl0fPlA RaqGwGzrSDDdtAKpu5J7b8iyrYt+1P7FTQ2MsyQ8xulPyL7sWSBxaI4PlOxlnrtv2XDT whS+HWuU5CMrHrjCxXKmxWxTfvVBHyexLGTDyIITFCvjri9PwPCPhlntXiDOoxBlbZ9l 6cXKT9y1z1e8VoX6qC/Vdf0Z+2Yrh9jJFyi6dEdzDff+dIdrCFcj16HaYFLwju7GauDu ktzw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:content-transfer-encoding :in-reply-to; bh=bFiTMfrDGaWBCg0p94Ve9DO2sWATZ48G3jOzHUgim7g=; b=A7NEXZ7njdEmMLsi3Gzh4+quViDxQImyhSzadUi769ScARkJ65QZyHuarjd3BCvIGZ f+rGKGkQ2bACtBFo7yyL55gJ8X0V2K9AlEEln067DgfRNuiVnAT0q7/WMtDbdtdVNfQs 9XDo7JJtamVHF/H8u5q8kQmkVk+nyKAa9VF5cNehHsLfg1xPb2cJf74s0SbCI+nUnGV/ sC8i2xlZuTI1EOxUujagTagaPAZO7UO9zCd7CgLrjGzRBAdzEtXGbXsgWaM8VqvZKGBe Ni07j9qzfBBuqf/zWV24zqKtgGgC6Hpl3+rHJfDnwUqgs9MNbZc3aPUxGHUL5HPdaSDR Bwdg== X-Gm-Message-State: AOAM532OTubl4dlB5pv/ykM8JitHue0c5p7Pufa2S+qMsMlnRPrV3/wA C+s+xSIpsVrX4brUeC695rFRog== X-Google-Smtp-Source: ABdhPJxlkgBIS/VbsDJv1LdNt0bSAI4XsoXwQotmWBDepPddTczE/Ide+Q97wd0zG6r/nHPHYmU+3A== X-Received: by 2002:a1c:9692:: with SMTP id y140mr2471242wmd.128.1612254514666; Tue, 02 Feb 2021 00:28:34 -0800 (PST) Received: from dell ([91.110.221.188]) by smtp.gmail.com with ESMTPSA id l1sm29630262wrp.40.2021.02.02.00.28.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 02 Feb 2021 00:28:34 -0800 (PST) Date: Tue, 2 Feb 2021 08:28:32 +0000 From: Lee Jones To: Wenjia Zhao Cc: Daniel Thompson , Jingoo Han , Bartlomiej Zolnierkiewicz , dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] backlight: pcf50633: pdata may be a null pointer, null pointer dereference cause crash Message-ID: <20210202082832.GA4774@dell> References: <1612190499-73818-1-git-send-email-driverfuzzing@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <1612190499-73818-1-git-send-email-driverfuzzing@gmail.com> Precedence: bulk List-ID: X-Mailing-List: linux-fbdev@vger.kernel.org On Mon, 01 Feb 2021, Wenjia Zhao wrote: Please provide a suitable commit messages. Describe the problem. Describe the issue was found. Describe the solution. > Signed-off-by: Wenjia Zhao > --- > drivers/video/backlight/pcf50633-backlight.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/drivers/video/backlight/pcf50633-backlight.c b/drivers/video/backlight/pcf50633-backlight.c > index 540dd338..43267af 100644 > --- a/drivers/video/backlight/pcf50633-backlight.c > +++ b/drivers/video/backlight/pcf50633-backlight.c > @@ -127,7 +127,8 @@ static int pcf50633_bl_probe(struct platform_device *pdev) > > platform_set_drvdata(pdev, pcf_bl); > > - pcf50633_reg_write(pcf_bl->pcf, PCF50633_REG_LEDDIM, pdata->ramp_time); > + if (pdata) > + pcf50633_reg_write(pcf_bl->pcf, PCF50633_REG_LEDDIM, pdata->ramp_time); A tab should be 8 chars in Linux. > /* > * Should be different from bl_props.brightness, so we do not exit -- Lee Jones [李琼斯] Senior Technical Lead - Developer Services Linaro.org │ Open source software for Arm SoCs Follow Linaro: Facebook | Twitter | Blog