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=-8.8 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, 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 85A1CC282E1 for ; Mon, 22 Apr 2019 19:48:41 +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 545182190B for ; Mon, 22 Apr 2019 19:48:41 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="I2z3ajLR"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="OExUsnCC" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 545182190B 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=G1sbeIEN8s5CPVYpdbJyW8JJfeFN9Su2UpSwcDUIceg=; b=I2z3ajLRSZYDm4 sKxlhYVkvD3BxN2vFZZGOyDci/0f/NXxNN+GXOCZqS4oHpzDqsXVUWDO+/pqvyc5X8/oopx8UxG5w EcPQO2IFRE4O/hNSUahr/zJJLBj0yXQOJ/A6S86f6s7Xk2KobHT4EPyd/+b/GpZVjPfnRZGG/HOgp 65Ud71w+YoKyY7ZekjV/vNCRdT85rWvAj33RHinA9Wga5JczZKoY5iaFH2oniDUzRcRjOpKDoFLml 7EQ/QbBMNlLew8IZ16wj1T1FNIsfSAxgfcVrAsfrOlY+ITSD7LTaR6dbZonX9pTD3QgXSIKuxj0gh BUBmzh67i4FAU+WgaBTg==; 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 1hIevc-0004c1-FP; Mon, 22 Apr 2019 19:48:36 +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 1hIevW-0004TV-GR for linux-amlogic@lists.infradead.org; Mon, 22 Apr 2019 19:48:34 +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 5974221907; Mon, 22 Apr 2019 19:48:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1555962510; bh=AHATJrRfFd3WtExnSB8+3RdqrrSggX2Bz6a1LFnPAhs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=OExUsnCCS548w9OnaMYHqxFtEOQmVScdFhu/e+lJueFeYfrrpkBSI0nlXYhImlPHu GOKkkSfIIrg61c73rMyyq8ErRsWci7d61v1ZahyAdG2M7ZkdVUvkyD5jU/N19/794t 7ABlWWcNHguyRaLKg7erLAOzOM+Adb66Ikz2CD7g= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Subject: [PATCH AUTOSEL 4.14 31/43] drm/meson: Uninstall IRQ handler Date: Mon, 22 Apr 2019 15:47:15 -0400 Message-Id: <20190422194727.12495-31-sashal@kernel.org> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20190422194727.12495-1-sashal@kernel.org> References: <20190422194727.12495-1-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_124830_990715_4EE5A456 X-CRM114-Status: GOOD ( 12.33 ) 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 2d8f92897ad816f5dda54b2ed2fd9f2d7cb1abde ] meson_drv_unbind() doesn't unregister the IRQ handler, which can lead to use-after-free if the IRQ fires after unbind: [ 64.656876] Unable to handle kernel paging request at virtual address ffff000011706dbc ... [ 64.662001] pc : meson_irq+0x18/0x30 [meson_drm] I'm assuming that a similar problem could happen on the error path of bind(), so uninstall the IRQ handler there as well. 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/20190322152657.13752-2-jean-philippe.brucker@arm.com Signed-off-by: Sasha Levin (Microsoft) --- drivers/gpu/drm/meson/meson_drv.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/meson/meson_drv.c b/drivers/gpu/drm/meson/meson_drv.c index 1a1b0b9cf1fa..0608243c3387 100644 --- a/drivers/gpu/drm/meson/meson_drv.c +++ b/drivers/gpu/drm/meson/meson_drv.c @@ -277,10 +277,12 @@ static int meson_drv_bind_master(struct device *dev, bool has_components) ret = drm_dev_register(drm, 0); if (ret) - goto free_drm; + goto uninstall_irq; return 0; +uninstall_irq: + drm_irq_uninstall(drm); free_drm: drm_dev_unref(drm); @@ -298,6 +300,7 @@ static void meson_drv_unbind(struct device *dev) struct drm_device *drm = priv->drm; drm_dev_unregister(drm); + drm_irq_uninstall(drm); drm_kms_helper_poll_fini(drm); drm_fbdev_cma_fini(priv->fbdev); drm_mode_config_cleanup(drm); -- 2.19.1 _______________________________________________ linux-amlogic mailing list linux-amlogic@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-amlogic