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=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,T_DKIMWL_WL_HIGH,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 DEEEEC43219 for ; Thu, 2 May 2019 15:47:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A62D7204EC for ; Thu, 2 May 2019 15:47:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1556812020; bh=rfnD1DDuit9QawVxPT4jQHRi6d0WphtiqeoarjV9JJo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=NaLIYdPGc8DKrIGSdAy5BoS9GCokgpaXs+pN8t0Nq1xyNdhZFCdHqDzQa59KrNybt ACdpEzR2zAocGiJET4VjYwlSeJ2TdWOPt5FdFeXjjHRDSQfyP1Zgw/2IaGnY5RqHVM fAVGj4WOz2+FqNG2nmX7UmQ3LOpxXgrBaOMCOXr4= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726724AbfEBPYj (ORCPT ); Thu, 2 May 2019 11:24:39 -0400 Received: from mail.kernel.org ([198.145.29.99]:40588 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726769AbfEBPYi (ORCPT ); Thu, 2 May 2019 11:24:38 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id ADA382085A; Thu, 2 May 2019 15:24:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1556810678; bh=rfnD1DDuit9QawVxPT4jQHRi6d0WphtiqeoarjV9JJo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=qqwydqLrzkdPNZdrJlecWERtxIKEj6GohGLbS7W3MawTX+Y0+qExzSZM7NkrnVHzz /+FcO7/7mSG3PQyubklBbuSsBYbf1lSFfkNykfd/qqVzyzxVQ2X9VEp7HyUmLusS3B zlHQAoKMPgrIXZXPPF9NUt++laCGkw7U0l5OqSeg= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Jean-Philippe Brucker , Neil Armstrong , "Sasha Levin (Microsoft)" Subject: [PATCH 4.14 38/49] drm/meson: Uninstall IRQ handler Date: Thu, 2 May 2019 17:21:15 +0200 Message-Id: <20190502143328.724426473@linuxfoundation.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190502143323.397051088@linuxfoundation.org> References: <20190502143323.397051088@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org [ 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