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=-9.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, 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 3D4F6C10F11 for ; Mon, 22 Apr 2019 19:57:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 01AA42075A for ; Mon, 22 Apr 2019 19:57:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1555963046; bh=AHATJrRfFd3WtExnSB8+3RdqrrSggX2Bz6a1LFnPAhs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=ysPRTFSAPbt61WfczWLHsiEXbSdKlaArRSbcdYyFsioKO/fJz3NjhKsiM/ou3oncY PUDMFZ/2CGJUh7JgQ5ly4DYn9VnUZv9r41+CsxVV99+mjxLZV6b4MpzTmEExE+Q+H9 P3+0iPJqi7TiKifcMzZfOph26tHNZ1R+v0P58H1k= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730592AbfDVTsi (ORCPT ); Mon, 22 Apr 2019 15:48:38 -0400 Received: from mail.kernel.org ([198.145.29.99]:51782 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730555AbfDVTsa (ORCPT ); Mon, 22 Apr 2019 15:48:30 -0400 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 Cc: Jean-Philippe Brucker , Neil Armstrong , Sasha Levin , dri-devel@lists.freedesktop.org, linux-amlogic@lists.infradead.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 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.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