From patchwork Wed Apr 5 08:29:26 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeffy Chen X-Patchwork-Id: 9663541 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 3BDD1602B8 for ; Wed, 5 Apr 2017 09:30:01 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 398632684F for ; Wed, 5 Apr 2017 09:30:01 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 2E02D2859A; Wed, 5 Apr 2017 09:30:01 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.9 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [65.50.211.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id AA5602684F for ; Wed, 5 Apr 2017 09:30:00 +0000 (UTC) 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:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id: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=+CELMrf5e2c4jmfrjbkKHB2e3y3Y+jsI6+geN3XbgKk=; b=eN/UnlFPG+bcbdtSk1JPI6XxVy P54Ax1RPKoRuMB0YNlvgZ4H2lSSWOTuMBYF72uWStCAe11/ijE7ZIxTxR/hinpFm8oS94t3CWb1Br IFgfC6TBGRR1mPDYGtzT7QVsvpowUz01PIRfWP4IAZEO6ntWMj3lY641y9b1Cex/fO0OijeJ00KiM Z6jz+n9eZUGR71y9uV1on1vhndfVNU6AJgtiBc1EF5ySyyYOwmQntySaxDJFFhDWptz44RjraQNu2 +T9rrO5E8ZXoYmuwGxtFen/Mel6vG9aXgBlgi0CytVEmVmqmqXA/YMKrY33v7W/3twAAaq5Q+XiNx 6UTGcBrg==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux)) id 1cvhGJ-0001Iz-Fc; Wed, 05 Apr 2017 09:29:59 +0000 Received: from merlin.infradead.org ([2001:4978:20e::2]) by bombadil.infradead.org with esmtps (Exim 4.87 #1 (Red Hat Linux)) id 1cvgx8-0008EO-13; Wed, 05 Apr 2017 09:10:10 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=merlin.20170209; h=References:In-Reply-To:Message-Id:Date: Subject:Cc:To:From:Sender:Reply-To:MIME-Version:Content-Type: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=TtMkVf8ISyiTYdOJcDWZD7Y3yUoMzzkX9l7VDko3mlw=; b=cDkGqQNfjmXuNv2UlAHEAuYzI 8ec4bfpbge2YeNLmr6qN3sfGqPmEMApytCAd1cOpPd8d2hqRRGhpcrxHxer3eC/My0aSZe5rFAM7S 5aFUzl2p3h1qGtrwEwqrdg8MEN/0sq66dXgG76mtTAoHIzsgN3wiFxg/41yGA4ldyo+U+OK/t9MYe GRiyFEwfdYcoo0zwO+uoIVVnSIgI8KI5Tvlqd4WcBvY25MDAOYfXDARgRuRYoC9JrTAXNocLX4h7X WL9VOae+q765GIwtHGw8jQg/nbV1Ti8WHs5WZ/3bBNeAOrM0Mo0m0yiD85kT57MejBV36ATWgR1TI SCza6+QoQ==; Received: from regular1.263xmail.com ([211.150.99.138]) by merlin.infradead.org with esmtps (Exim 4.87 #1 (Red Hat Linux)) id 1cvgM0-0002DZ-Ef; Wed, 05 Apr 2017 08:31:49 +0000 Received: from jeffy.chen?rock-chips.com (unknown [192.168.165.141]) by regular1.263xmail.com (Postfix) with ESMTP id 72B777A88; Wed, 5 Apr 2017 16:31:12 +0800 (CST) X-263anti-spam: KSV:0; X-MAIL-GRAY: 0 X-MAIL-DELIVERY: 1 X-KSVirus-check: 0 X-ABS-CHECKED: 4 Received: from smtp.263.net (sg-smtp01.263.net [54.255.195.220]) by smtp.263.net (Postfix) with ESMTP id E56BE4D7; Wed, 5 Apr 2017 16:30:46 +0800 (CST) Received: from localhost (localhost.localdomain [127.0.0.1]) by smtp.263.net (Postfix) with ESMTP id A2F48DF2ED; Wed, 5 Apr 2017 16:30:36 +0800 (CST) X-RL-SENDER: jeffy.chen@rock-chips.com X-FST-TO: linux-kernel@vger.kernel.org X-SENDER-IP: 103.29.142.67 X-LOGIN-NAME: jeffy.chen@rock-chips.com X-UNIQUE-TAG: X-ATTACHMENT-NUM: 0 X-SENDER: cjf@rock-chips.com X-DNS-TYPE: 0 Received: from localhost (unknown [103.29.142.67]) by smtp.263.net (Postfix) whith ESMTP id 14450ZLQMGT; Wed, 05 Apr 2017 16:30:38 +0800 (CST) From: Jeffy Chen To: linux-kernel@vger.kernel.org Subject: [PATCH v3 8/9] drm/rockchip: gem: Don't alloc/free gem buf when dev_private is invalid Date: Wed, 5 Apr 2017 16:29:26 +0800 Message-Id: <1491380967-28570-9-git-send-email-jeffy.chen@rock-chips.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1491380967-28570-1-git-send-email-jeffy.chen@rock-chips.com> References: <1491380967-28570-1-git-send-email-jeffy.chen@rock-chips.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20170405_043148_992338_83D8E907 X-CRM114-Status: UNSURE ( 7.68 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-rockchip@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: Upstream kernel work for Rockchip platforms List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Jeffy Chen , Heiko Stuebner , David Airlie , briannorris@chromium.org, dianders@chromium.org, dri-devel@lists.freedesktop.org, tfiga@chromium.org, linux-rockchip@lists.infradead.org, seanpaul@chromium.org, zyw@rock-chips.com, linux-arm-kernel@lists.infradead.org, mark.yao@rock-chips.com MIME-Version: 1.0 Sender: "Linux-rockchip" Errors-To: linux-rockchip-bounces+patchwork-linux-rockchip=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP After unbinding drm, the userspace may still has a chance to access gem buf. Add a sanity check for a NULL dev_private to prevent that from happening. Signed-off-by: Jeffy Chen --- Changes in v3: Address Daniel Vetter 's comments. Update commit message. Changes in v2: None drivers/gpu/drm/rockchip/rockchip_drm_gem.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_gem.c b/drivers/gpu/drm/rockchip/rockchip_drm_gem.c index df9e570..205a3dc 100644 --- a/drivers/gpu/drm/rockchip/rockchip_drm_gem.c +++ b/drivers/gpu/drm/rockchip/rockchip_drm_gem.c @@ -184,6 +184,9 @@ static int rockchip_gem_alloc_buf(struct rockchip_gem_object *rk_obj, struct drm_device *drm = obj->dev; struct rockchip_drm_private *private = drm->dev_private; + if (!private) + return -ENODEV; + if (private->domain) return rockchip_gem_alloc_iommu(rk_obj, alloc_kmap); else @@ -208,6 +211,11 @@ static void rockchip_gem_free_dma(struct rockchip_gem_object *rk_obj) static void rockchip_gem_free_buf(struct rockchip_gem_object *rk_obj) { + struct drm_device *drm = rk_obj->base.dev; + + if (!drm->dev_private) + return; + if (rk_obj->pages) rockchip_gem_free_iommu(rk_obj); else