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=-9.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS, USER_AGENT_GIT 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 3C0B1C282CE for ; Mon, 22 Apr 2019 19:47:00 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 07E6C21902 for ; Mon, 22 Apr 2019 19:47:00 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="GCh09nVg"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="2oFa5Ft2" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 07E6C21902 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-amlogic-bounces+linux-amlogic=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=Xtb4Ddy15JlEp3JCJPqmxrwFksC6LxvfXyWB6nO+rTM=; b=GCh09nVgTM3KZG APoX9eDMrZIvmxlKl4QR/4HRDLyH+MMNQiHyQn/dXtX9AQFwcJZvBqpJI4F73yk0OpewroCBeACUp ns66O9a3vojJR3dNx6wDIfyUAvHe1+Op9Sec6tzUVG/RJ6WB3afxXr/Xo2EjGo78I1A6p04bLjkOY awnI2QCDr+1TCtVUBaLpRbEWQewMizfz9AAhXpgkpPB4bHfo3jwecRmRl1wqHzs82TPeRHBoBNkXK 7ozjJNSMfdo6WPbdSVxQTzw/5L7ncQCZwjQwKatO2x5n80Q7EwRuKttxGymEHOoI80Bupssv+CkiH pQjcEQgSDyVWfSQ2hwBA==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1hIetz-0003tT-8R; Mon, 22 Apr 2019 19:46:55 +0000 Received: from mail.kernel.org ([198.145.29.99]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1hIett-0003lA-Mq for linux-amlogic@lists.infradead.org; Mon, 22 Apr 2019 19:46:52 +0000 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 825ED21908; Mon, 22 Apr 2019 19:46:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1555962409; bh=9/a6HhSKGbb15EAo6nsqJWLRiQ0p2SWOP1V6sqzh+ZA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=2oFa5Ft28EmH4SlXpALiFNhqZXTG1x5W5fQH/pw1Ljk06lOgRShBeC6Eyni/alPIh l6Kr5KiHMDKGihMU3hphtnU3wkt3AobELVAJ54CZ1X4/Z9yZRrhDxzgwZOcS/dzCJ0 1qGVx2Ek2LiTWJEbkAVUDR/thBNGP+zuxEJwMSCQ= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Subject: [PATCH AUTOSEL 4.19 45/68] drm/meson: Fix invalid pointer in meson_drv_unbind() Date: Mon, 22 Apr 2019 15:44:53 -0400 Message-Id: <20190422194516.11634-45-sashal@kernel.org> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20190422194516.11634-1-sashal@kernel.org> References: <20190422194516.11634-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190422_124650_202990_64093E6C X-CRM114-Status: GOOD ( 11.50 ) X-BeenThere: linux-amlogic@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Jean-Philippe Brucker , Sasha Levin , linux-amlogic@lists.infradead.org, dri-devel@lists.freedesktop.org, Neil Armstrong Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-amlogic" Errors-To: linux-amlogic-bounces+linux-amlogic=archiver.kernel.org@lists.infradead.org From: Jean-Philippe Brucker [ Upstream commit 776e78677f514ecddd12dba48b9040958999bd5a ] meson_drv_bind() registers a meson_drm struct as the device's privdata, but meson_drv_unbind() tries to retrieve a drm_device. This may cause a segfault on shutdown: [ 5194.593429] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000197 ... [ 5194.788850] Call trace: [ 5194.791349] drm_dev_unregister+0x1c/0x118 [drm] [ 5194.795848] meson_drv_unbind+0x50/0x78 [meson_drm] Retrieve the right pointer in meson_drv_unbind(). Fixes: bbbe775ec5b5 ("drm: Add support for Amlogic Meson Graphic Controller") Signed-off-by: Jean-Philippe Brucker Acked-by: Neil Armstrong Signed-off-by: Neil Armstrong Link: https://patchwork.freedesktop.org/patch/msgid/20190322152657.13752-1-jean-philippe.brucker@arm.com Signed-off-by: Sasha Levin (Microsoft) --- drivers/gpu/drm/meson/meson_drv.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/meson/meson_drv.c b/drivers/gpu/drm/meson/meson_drv.c index 611ac340fb28..4a72fa53a1d5 100644 --- a/drivers/gpu/drm/meson/meson_drv.c +++ b/drivers/gpu/drm/meson/meson_drv.c @@ -317,8 +317,8 @@ static int meson_drv_bind(struct device *dev) static void meson_drv_unbind(struct device *dev) { - struct drm_device *drm = dev_get_drvdata(dev); - struct meson_drm *priv = drm->dev_private; + struct meson_drm *priv = dev_get_drvdata(dev); + struct drm_device *drm = priv->drm; drm_dev_unregister(drm); drm_kms_helper_poll_fini(drm); -- 2.19.1 _______________________________________________ linux-amlogic mailing list linux-amlogic@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-amlogic