From patchwork Fri Jun 18 13:49:02 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pavel Skripkin X-Patchwork-Id: 463736 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=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,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 D5B42C48BE8 for ; Fri, 18 Jun 2021 13:50:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B26CB613EC for ; Fri, 18 Jun 2021 13:50:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234061AbhFRNwg (ORCPT ); Fri, 18 Jun 2021 09:52:36 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36520 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233444AbhFRNwf (ORCPT ); Fri, 18 Jun 2021 09:52:35 -0400 Received: from mail-lj1-x230.google.com (mail-lj1-x230.google.com [IPv6:2a00:1450:4864:20::230]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3B6BFC061574; Fri, 18 Jun 2021 06:50:26 -0700 (PDT) Received: by mail-lj1-x230.google.com with SMTP id b37so14087357ljr.13; Fri, 18 Jun 2021 06:50:26 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=PF1lwVLZjO0TaZRIPSE+RYDa9z8BPF1tUWPYliWRKnc=; b=HNXfeSlEg8BXH11sQ4vpGj1n8hXO2g66OnPe8iX33KoxwRFq3Xw2r4ZMhqDyQUNttq 55BcvKOnz8mw9DYDTCzab4t3h3LOi//dCYSbUst9nWsRkVxGIaPdV+7sLC4j/n+vXovo B4oa9Rq34Q/FqSz/S9AtSl2rlUj8CTkk87aULV5oZ+p8j0CgkhP7ZQ5LDFQ8GbazkpxT Hjx/U0d6o3tDfH6RsitHSwfIUaocAZrSCijVmUmNXvzkXOxiW6tmQiwPfjKgyLbM0YST +nN0JMwjrHlCaDBg3j8YhqR3Ti2KDaddq1o+Wmo8ZVwbieTCtlnSetjOzF1McbrbnAzg TIgg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=PF1lwVLZjO0TaZRIPSE+RYDa9z8BPF1tUWPYliWRKnc=; b=sLJKmsIXmsNsSnLhCvG4BxTIDHgrvb+kzYh/AsT/S+fEt/iQrOddTyWE8UxJNrTiPx k/U8N8vgc+v/FwVsN3A12SCFYhpjOMKUUSXjpFTKpEoztzCoBIA6BEb/vfmWBEy1wXzD cjD1J3tho4t7nZmt2s7XcGjSo8rj32S8Qi2mcWMb4JCRdZR/mFhNiRVuHr0GD3iyVjht GlEXenQoGUAMMfduU0EDao0HawZjVddHUNw/EOoyiEjEndpAVkWRbxJHgvgTCbOPVtB1 5pLRydToeywTcoq49lC0UjnKZHOElotRxliAsTL4rTeb3aqtsYEqii98fQM93mUHKKS2 l3Vw== X-Gm-Message-State: AOAM533+92PPalG8p4sxsZlCKHmFs7GVk2zNPiCm2wRcxHqqrcOlmvtU Fo/IS/YGvC2xoBvequn40KY= X-Google-Smtp-Source: ABdhPJxrJ9TDOw/Wl4DcvgjPxkQjBduGj9Lc2qQ214ODXqD3Tm33ax8AK4edkHfd/5Z3WlnEQR+5Ig== X-Received: by 2002:a2e:580e:: with SMTP id m14mr9599947ljb.197.1624024224596; Fri, 18 Jun 2021 06:50:24 -0700 (PDT) Received: from localhost.localdomain ([94.103.229.24]) by smtp.gmail.com with ESMTPSA id r9sm918112lfm.158.2021.06.18.06.50.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 18 Jun 2021 06:50:23 -0700 (PDT) From: Pavel Skripkin To: reksio@newterm.pl, davem@davemloft.net, kuba@kernel.org Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kernel-mentees@lists.linuxfoundation.org, Pavel Skripkin Subject: [PATCH] net: ethernet: fix potential use-after-free in ec_bhf_remove Date: Fri, 18 Jun 2021 16:49:02 +0300 Message-Id: <20210618134902.9793-1-paskripkin@gmail.com> X-Mailer: git-send-email 2.32.0 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org static void ec_bhf_remove(struct pci_dev *dev) { ... struct ec_bhf_priv *priv = netdev_priv(net_dev); unregister_netdev(net_dev); free_netdev(net_dev); pci_iounmap(dev, priv->dma_io); pci_iounmap(dev, priv->io); ... } priv is netdev private data, but it is used after free_netdev(). It can cause use-after-free when accessing priv pointer. So, fix it by moving free_netdev() after pci_iounmap() calls. Fixes: 6af55ff52b02 ("Driver for Beckhoff CX5020 EtherCAT master module.") Signed-off-by: Pavel Skripkin --- drivers/net/ethernet/ec_bhf.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/net/ethernet/ec_bhf.c b/drivers/net/ethernet/ec_bhf.c index 46b0dbab8aad..7c992172933b 100644 --- a/drivers/net/ethernet/ec_bhf.c +++ b/drivers/net/ethernet/ec_bhf.c @@ -576,10 +576,12 @@ static void ec_bhf_remove(struct pci_dev *dev) struct ec_bhf_priv *priv = netdev_priv(net_dev); unregister_netdev(net_dev); - free_netdev(net_dev); pci_iounmap(dev, priv->dma_io); pci_iounmap(dev, priv->io); + + free_netdev(net_dev); + pci_release_regions(dev); pci_clear_master(dev); pci_disable_device(dev);