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=-15.7 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,URIBL_BLOCKED,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 4113FC4338F for ; Tue, 10 Aug 2021 09:18:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 257EC60720 for ; Tue, 10 Aug 2021 09:18:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238840AbhHJJSv (ORCPT ); Tue, 10 Aug 2021 05:18:51 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47270 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237320AbhHJJSp (ORCPT ); Tue, 10 Aug 2021 05:18:45 -0400 Received: from mail-pl1-x62a.google.com (mail-pl1-x62a.google.com [IPv6:2607:f8b0:4864:20::62a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 67DFBC061799; Tue, 10 Aug 2021 02:18:24 -0700 (PDT) Received: by mail-pl1-x62a.google.com with SMTP id u16so20151068ple.2; Tue, 10 Aug 2021 02:18:24 -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=w+XOmb9EKTUysSLlZUkv3LmEhzI+OrIVJ3S44VA1yDo=; b=corIsdxSFyN7QcwU9IowkhXaEYzWaCYQjd/rt+eGl7DB/oby6g5Tk6+IEW+amdTKf/ 7ev3yYjnd1m6WgPzbZr13U1M2J8sv4xlQJ5RHuOGeu4XJzas7SbTcGY1vbyApklVl8Tt I7gxzpvYi++OMmtAMf3HhycHVUbcjXeTBPF2XADmn+JynjVbrxDrKzWMHdQZdgNqIiNO YN5C9CCOETRD+JGjsCgsteP4M+knjMNQHi1iPTXVhcqwzzD1NpmryFcWf2McEBbf8QpK UzN3kdrRGaCBjAk3zDnIYVNCItikepEcBz3Iibgx3CVog2iw26cN66kCOLTeKe4QYARI hrMQ== 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=w+XOmb9EKTUysSLlZUkv3LmEhzI+OrIVJ3S44VA1yDo=; b=WYi+Q73ZFCdeNsxZ0OoGBNIaiulxX3gsbgs/b4iPleJ5RZEbdYhzNlcV4T6e+DyoNA kuu0EYoNyhnZdcg21EPSsoCD9SWbI6iCEqgQ2YAu1ueYXm2p0ojCOZsTJN01r931OJ5l IIcRQHqWWb7VwYmg/l9sRcGSCn6zD1u7ksVjHD0xxk/wVSRGsTCg9dqDjW2Hs0BZb4jP +tXr3wTaCvxZZixIEdezBCqv61ZqlIQBOgaHHXB1YU9dI/1Vm1jCZQO3U4yM85gVXTWR wG+GGlDUAZIe89W18TCA8OnQO6KXNhvZzIGhrrBF9MpXj+x7JTIEdBY9TNtpwaezy3CG Dy6g== X-Gm-Message-State: AOAM531b8r5Bfax1LrGfoAXmYwyZ0SCyzrOGH+lRgAdvH9iERSWCqQ1t mAQzPODsqj2fW8gp0Q/X6EM= X-Google-Smtp-Source: ABdhPJznUQMbjUf5j9hsDN3vDvvQ9YB0D2WEhdHvBC4TfnelnS19szODZs9Te4i0BiGtx0L8QFXU1w== X-Received: by 2002:a17:90b:296:: with SMTP id az22mr3854614pjb.79.1628587103929; Tue, 10 Aug 2021 02:18:23 -0700 (PDT) Received: from localhost.localdomain ([45.135.186.40]) by smtp.gmail.com with ESMTPSA id k6sm2252089pjl.55.2021.08.10.02.18.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 10 Aug 2021 02:18:23 -0700 (PDT) From: Tuo Li To: sridhar.samudrala@intel.com, davem@davemloft.net, kuba@kernel.org Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, baijiaju1990@gmail.com, Tuo Li , TOTE Robot Subject: [PATCH] net: core: Fix possible null-pointer dereference in failover_slave_register() Date: Tue, 10 Aug 2021 02:18:00 -0700 Message-Id: <20210810091800.291272-1-islituo@gmail.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org The variable fops is checked in: if (fops && fops->slave_pre_register && fops->slave_pre_register(slave_dev, failover_dev)) This indicates that it can be NULL. However, it is dereferenced when calling netdev_rx_handler_register(): err = netdev_rx_handler_register(slave_dev, fops->slave_handle_frame, failover_dev); To fix this possible null-pointer dereference, check fops first, and if it is NULL, assign -EINVAL to err. Reported-by: TOTE Robot Signed-off-by: Tuo Li --- net/core/failover.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/net/core/failover.c b/net/core/failover.c index b5cd3c727285..113a4dacdf48 100644 --- a/net/core/failover.c +++ b/net/core/failover.c @@ -63,8 +63,11 @@ static int failover_slave_register(struct net_device *slave_dev) fops->slave_pre_register(slave_dev, failover_dev)) goto done; - err = netdev_rx_handler_register(slave_dev, fops->slave_handle_frame, + if (fops) + err = netdev_rx_handler_register(slave_dev, fops->slave_handle_frame, failover_dev); + else + err = -EINVAL; if (err) { netdev_err(slave_dev, "can not register failover rx handler (err = %d)\n", err); -- 2.25.1