From patchwork Mon Mar 29 07:58:18 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 411428 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=-19.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, 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 767DCC433E6 for ; Mon, 29 Mar 2021 08:24:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 56D16619C4 for ; Mon, 29 Mar 2021 08:24:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234247AbhC2IYR (ORCPT ); Mon, 29 Mar 2021 04:24:17 -0400 Received: from mail.kernel.org ([198.145.29.99]:49682 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231993AbhC2IGv (ORCPT ); Mon, 29 Mar 2021 04:06:51 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id BF19861601; Mon, 29 Mar 2021 08:06:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1617005211; bh=UqKxY8JrXkGafpGGXo/vi1eZjNzvixcPNWB8ebfj0EY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Vi2Q8NSKDLpChVqC9Z1Cmk+jDgEvvrTQ0oE1Uxtps514fJUAkTrLSINWO6n43s3ap aEQ9isRaQTQ9qEnAujq1Xfj1f9TxkrOJbFgkRwA0mT5M9PUZqFA3soHtTGSLIhLGDp jpZw+ns9Ca7RV5fn6SFF0FiUBgwZx1ZjxD/WE/dA= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Tong Zhang , Marc Kleine-Budde , Sasha Levin Subject: [PATCH 4.14 38/59] can: c_can_pci: c_can_pci_remove(): fix use-after-free Date: Mon, 29 Mar 2021 09:58:18 +0200 Message-Id: <20210329075610.142096952@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210329075608.898173317@linuxfoundation.org> References: <20210329075608.898173317@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Tong Zhang [ Upstream commit 0429d6d89f97ebff4f17f13f5b5069c66bde8138 ] There is a UAF in c_can_pci_remove(). dev is released by free_c_can_dev() and is used by pci_iounmap(pdev, priv->base) later. To fix this issue, save the mmio address before releasing dev. Fixes: 5b92da0443c2 ("c_can_pci: generic module for C_CAN/D_CAN on PCI") Link: https://lore.kernel.org/r/20210301024512.539039-1-ztong0001@gmail.com Signed-off-by: Tong Zhang Signed-off-by: Marc Kleine-Budde Signed-off-by: Sasha Levin --- drivers/net/can/c_can/c_can_pci.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/net/can/c_can/c_can_pci.c b/drivers/net/can/c_can/c_can_pci.c index d065c0e2d18e..f3e0b2124a37 100644 --- a/drivers/net/can/c_can/c_can_pci.c +++ b/drivers/net/can/c_can/c_can_pci.c @@ -239,12 +239,13 @@ static void c_can_pci_remove(struct pci_dev *pdev) { struct net_device *dev = pci_get_drvdata(pdev); struct c_can_priv *priv = netdev_priv(dev); + void __iomem *addr = priv->base; unregister_c_can_dev(dev); free_c_can_dev(dev); - pci_iounmap(pdev, priv->base); + pci_iounmap(pdev, addr); pci_disable_msi(pdev); pci_clear_master(pdev); pci_release_regions(pdev);