From patchwork Wed Aug 4 15:51:51 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pavel Skripkin X-Patchwork-Id: 492740 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=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 E8C52C4338F for ; Wed, 4 Aug 2021 15:52:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C97BA60FC4 for ; Wed, 4 Aug 2021 15:52:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239548AbhHDPwX (ORCPT ); Wed, 4 Aug 2021 11:52:23 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46210 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233230AbhHDPwW (ORCPT ); Wed, 4 Aug 2021 11:52:22 -0400 Received: from mail-lf1-x131.google.com (mail-lf1-x131.google.com [IPv6:2a00:1450:4864:20::131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 06CBDC0613D5; Wed, 4 Aug 2021 08:52:09 -0700 (PDT) Received: by mail-lf1-x131.google.com with SMTP id c24so1966453lfi.11; Wed, 04 Aug 2021 08:52:08 -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:in-reply-to:references :mime-version:content-transfer-encoding; bh=LOerQFZ0jK8/gKUx7F6VWzq+EmsyF6Mh3+2EWyBwV7k=; b=WxflTTjBUcRlekTmCCDw38zuvU4FNXPHhQjcZ7jbxeVORh5S85vqOYRllxyWYgS7Zg vxfaf3QBRh7yOO5gxN76nvOiaGtXeh7K2QCJH/C7098CRiVup0TXdyJodFhPctFSclmt 2JDdCpe3Kskg1PwPo9Ksiad01ocnHZn96FE+FvEglegL60NCXxi3JR05VOwZvGI7iZ8X VN5VJKQoXegCc28K4oTADbzUUpUtS1Yjfb59hOpZxnn859XaLVQ7wPHjqu4qi19GKQJD an9ocK/KzADhJZdapLbWtE7BbaEfhkU+m0p8QXxmE6d5T5gR3xTHJGS8C+Jl1pNXgCZ2 AIjw== 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:in-reply-to :references:mime-version:content-transfer-encoding; bh=LOerQFZ0jK8/gKUx7F6VWzq+EmsyF6Mh3+2EWyBwV7k=; b=RdmF9CJcMqLAOMuo2d1eiacyg1qvT3M72rFpiAchQcLj9crAUpX9YOfYrGi7CINHY9 jnbpzUqgNR6wMaq+/jURMxiB5nRsSsvyLQJEZNydV6pQFUhU6h3S9VJbnu8SbH0Akak+ j0m53eDeg3eDazq/EIgHiKF6EAzk1iGb7FoGm7erEy2oUfHT7OP3n820OOJplCqjNMQ2 AQvn7Yl7v8ROGx0PjCBq8bBX0MxkxIrS4bImZkIATYxxbh8fr2iOHGsW0DUBf8KuFbA4 8LG7NFfXT6wAOVx8Ox8HDX2wxIpFoOKmPoZr3sveVK3Lx+mYQEHQnxk62i7CtU6QEQ4K 1IWA== X-Gm-Message-State: AOAM533v7sRQJwwurneXZBpESGk1b9BBJJPQJoG+dKj3J/j7dSexrujx auTXJo5jUsqNWmnReCOZD5k= X-Google-Smtp-Source: ABdhPJzsrxxqWvViyKle7Uk8+V1sK5RIVOnDfRgeJB9MD8pBmOEK6S3CmL9y00EWnS5fH33BS3UbeQ== X-Received: by 2002:a05:6512:3b89:: with SMTP id g9mr21267607lfv.96.1628092327374; Wed, 04 Aug 2021 08:52:07 -0700 (PDT) Received: from localhost.localdomain ([94.103.226.235]) by smtp.gmail.com with ESMTPSA id o8sm231658lfu.25.2021.08.04.08.52.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 04 Aug 2021 08:52:06 -0700 (PDT) From: Pavel Skripkin To: davem@davemloft.net, kuba@kernel.org, qiangqing.zhang@nxp.com, hslester96@gmail.com, fugang.duan@nxp.com Cc: dan.carpenter@oracle.com, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Pavel Skripkin Subject: [PATCH 1/2] net: fec: fix use-after-free in fec_drv_remove Date: Wed, 4 Aug 2021 18:51:51 +0300 Message-Id: <25ad9ae695546c0ce23edb25cb2a67575cbda26b.1628091954.git.paskripkin@gmail.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Smatch says: drivers/net/ethernet/freescale/fec_main.c:3994 fec_drv_remove() error: Using fep after free_{netdev,candev}(ndev); drivers/net/ethernet/freescale/fec_main.c:3995 fec_drv_remove() error: Using fep after free_{netdev,candev}(ndev); Since fep pointer is netdev private data, accessing it after free_netdev() call can cause use-after-free bug. Fix it by moving free_netdev() call at the end of the function Reported-by: Dan Carpenter Fixes: a31eda65ba21 ("net: fec: fix clock count mis-match") Signed-off-by: Pavel Skripkin --- drivers/net/ethernet/freescale/fec_main.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c index 8aea707a65a7..7e4c4980ced7 100644 --- a/drivers/net/ethernet/freescale/fec_main.c +++ b/drivers/net/ethernet/freescale/fec_main.c @@ -3843,13 +3843,13 @@ fec_drv_remove(struct platform_device *pdev) if (of_phy_is_fixed_link(np)) of_phy_deregister_fixed_link(np); of_node_put(fep->phy_node); - free_netdev(ndev); clk_disable_unprepare(fep->clk_ahb); clk_disable_unprepare(fep->clk_ipg); pm_runtime_put_noidle(&pdev->dev); pm_runtime_disable(&pdev->dev); + free_netdev(ndev); return 0; }