From patchwork Thu Jun 17 07:07:37 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jiajun Cao X-Patchwork-Id: 12326971 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=-16.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 D2F10C49361 for ; Thu, 17 Jun 2021 07:39:20 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 69705613CA for ; Thu, 17 Jun 2021 07:39:20 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 69705613CA Authentication-Results: mail.kernel.org; dmarc=fail (p=reject dis=none) header.from=fudan.edu.cn Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 1118A6E88D; Thu, 17 Jun 2021 07:39:19 +0000 (UTC) X-Greylist: delayed 481 seconds by postgrey-1.36 at gabe; Thu, 17 Jun 2021 07:18:09 UTC Received: from zg8tmty1ljiyny4xntqumjca.icoremail.net (zg8tmty1ljiyny4xntqumjca.icoremail.net [165.227.154.27]) by gabe.freedesktop.org (Postfix) with SMTP id 0A8896E884 for ; Thu, 17 Jun 2021 07:18:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fudan.edu.cn; s=dkim; h=Received:From:To:Cc:Subject:Date: Message-Id; bh=RptfClq4lVC//Zpto1J6NX77le/xD91mEpWrmjb1RGA=; b=C uZLQzNduNuyMh9i1HqU9MxtAnSBl+/+KRfqtdowwn8HhLDnrYy0IvxdTeVaAQ6Cf wlnOGv1PjxHsbnfkjWb56Ngqzp/DqmacJpbiU3lHOerIEsBkVkeZYzfB3mhNnvRA rO1r/ou9ZZZ7K8X6t4hUv6qRgYiNZlADquOmcEhh/Q= Received: from ubuntu (unknown [10.177.89.109]) by app1 (Coremail) with SMTP id XAUFCgAH6SFA9cpgKJl6AA--.64384S3; Thu, 17 Jun 2021 15:09:52 +0800 (CST) From: Jiajun Cao To: Subject: [PATCH] drm/meson: fix potential NULL pointer exception in meson_drv_unbind() Date: Thu, 17 Jun 2021 15:07:37 +0800 Message-Id: <20210617070737.50171-1-jjcao20@fudan.edu.cn> X-Mailer: git-send-email 2.17.1 X-CM-TRANSID: XAUFCgAH6SFA9cpgKJl6AA--.64384S3 X-Coremail-Antispam: 1UD129KBjvdXoWrtryrKF1kZryrArW8CFyfWFg_yoWDKFg_CF W8Xrn7ur1Dur1Dtr429FW7ZFy2kF18ZF1fCw1kt3yfGFn7Zr1UZFWkuw1kXryfXr43ZFZx Z34kGr4rury7GjkaLaAFLSUrUUUUUb8apTn2vfkv8UJUUUU8Yxn0WfASr-VFAUDa7-sFnT 9fnUUIcSsGvfJTRUUUbSxFF20E14v26r4j6ryUM7CY07I20VC2zVCF04k26cxKx2IYs7xG 6rWj6s0DM7CIcVAFz4kK6r1j6r18M28lY4IEw2IIxxk0rwA2F7IY1VAKz4vEj48ve4kI8w A2z4x0Y4vE2Ix0cI8IcVAFwI0_tr0E3s1l84ACjcxK6xIIjxv20xvEc7CjxVAFwI0_GcCE 3s1l84ACjcxK6I8E87Iv67AKxVW0oVCq3wA2z4x0Y4vEx4A2jsIEc7CjxVAFwI0_GcCE3s 1lnxkEFVAIw20F6cxK64vIFxWle2I262IYc4CY6c8Ij28IcVAaY2xG8wAqx4xG64xvF2IE w4CE5I8CrVC2j2WlYx0E2Ix0cI8IcVAFwI0_Jr0_Jr4lYx0Ex4A2jsIE14v26r1j6r4UMc vjeVCFs4IE7xkEbVWUJVW8JwACjcxG0xvY0x0EwIxGrwACjI8F5VA0II8E6IAqYI8I648v 4I1lFIxGxcIEc7CjxVA2Y2ka0xkIwI1lc2xSY4AK6svPMxAIw28IcxkI7VAKI48JMxC20s 026xCaFVCjc4AY6r1j6r4UMI8I3I0E5I8CrVAFwI0_Jr0_Jr4lx2IqxVCjr7xvwVAFwI0_ JrI_JrWlx4CE17CEb7AF67AKxVWUtVW8ZwC2zVAIFx02awCIc40Y0x0EwIxGrwCI42IY6x IIjxv20xvE14v26r1j6r1xMIIF0xvE2Ix0cI8IcVCY1x0267AKxVW8JVWxJwCI42IY6xAI w20EY4v20xvaj40_WFyUJVCq3wCI42IY6I8E87Iv67AKxVWUJVW8JwCI42IY6I8E87Iv6x kF7I0E14v26r4j6r4UJbIYCTnIWIevJa73UjIFyTuYvjTRAl1kUUUUU X-CM-SenderInfo: isqsiiasuqikmw6i3vldqovvfxof0/ X-Mailman-Approved-At: Thu, 17 Jun 2021 07:39:18 +0000 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Xin Tan , Neil Armstrong , David Airlie , Kevin Hilman , yuanxzhang@fudan.edu.cn, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, Jiajun Cao , Martin Blumenstingl , linux-amlogic@lists.infradead.org, linux-arm-kernel@lists.infradead.org, Jerome Brunet Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Fix a potential NULL pointer exception when meson_drv_unbind() attempts to operate on the driver_data priv which may be NULL. Add a null pointer check on the priv struct to avoid the NULL pointer dereference after calling dev_get_drvdata(), just like the null pointer checks done on the struct priv in the function meson_drv_shutdown(), meson_drv_pm_suspend() and meson_drv_pm_resume(). Signed-off-by: Jiajun Cao Signed-off-by: Xin Tan --- drivers/gpu/drm/meson/meson_drv.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/gpu/drm/meson/meson_drv.c b/drivers/gpu/drm/meson/meson_drv.c index 07fcd12dca16..adea6a2b28f5 100644 --- a/drivers/gpu/drm/meson/meson_drv.c +++ b/drivers/gpu/drm/meson/meson_drv.c @@ -380,6 +380,8 @@ static int meson_drv_bind(struct device *dev) static void meson_drv_unbind(struct device *dev) { struct meson_drm *priv = dev_get_drvdata(dev); + if (!priv) + return; struct drm_device *drm = priv->drm; if (priv->canvas) {