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=-8.6 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,NICE_REPLY_A, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 7CD7CC41604 for ; Sat, 3 Oct 2020 21:45:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 483BC206CD for ; Sat, 3 Oct 2020 21:45:43 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="t5vw0QXH" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725988AbgJCVpi (ORCPT ); Sat, 3 Oct 2020 17:45:38 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60328 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725917AbgJCVph (ORCPT ); Sat, 3 Oct 2020 17:45:37 -0400 Received: from mail-pf1-x442.google.com (mail-pf1-x442.google.com [IPv6:2607:f8b0:4864:20::442]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 440D5C0613D0; Sat, 3 Oct 2020 14:45:36 -0700 (PDT) Received: by mail-pf1-x442.google.com with SMTP id e10so3375059pfj.1; Sat, 03 Oct 2020 14:45:36 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-transfer-encoding:content-language; bh=YkUAXQMPmvjUV9l+UJIlcFx5SdBT09naUQnGkHuj+B8=; b=t5vw0QXHPOchz1V8SraniNG+R+3YQuDdeEvq3g2ljZrqderQi+26wgYclnYhXJ3bXI KpES5mPif9CYTD6auU9HJR5Ip2Z4YDIA2iqq0wcS8YsEmk5DNaKp3mzWP2ViAeeRz1hB jFEnj5oBg0YCUPSSqDOk9nqEtz+rhAlZuaVWQwo8Th/T4pOaQcDhaEqZ9rAZOfwxHH1w ELEK1/CZP5C3Ai80dzQgEldxb6DlwNUXfjUDVYDWlRqiUOBxsMAIFsdfMC8M4wUD/6KM wzsPFkRU9i2hpuE1WzeL3VW3pS58H7unNDH2jtPj9v3/0d+8Hpw/RX35Z5KNj7B/0v9D uIlw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-transfer-encoding :content-language; bh=YkUAXQMPmvjUV9l+UJIlcFx5SdBT09naUQnGkHuj+B8=; b=jSfUZDR9LVAVWjHYOiNukck01wWoBiPWAIBaohnVK0s4VR4luD8NtAaB9xXTS+ARvJ uoYGypd6W6RfbYHBfzMt+Nr+iFyFpHp7EngHRlZktKrBKpP83z1EyPJzrixon3lvQ6zM XAaMjzRD7CQ7ie6iHTyIi4iJ+zXr6PjrzYPwh6VxayOC2GLovFGlbl1Ixutug13Upr/w K0hUGlgEWazbKbW7HArHqdWoj2YZ31NfVqUwcQwOcFnh8TtfNKmngKQ3hIHYAJcyK1qW gQqq5qGbXebV8ECLLDDXEeFgK+5B2wWL3ibjZZ58CtoKAULw1tkmXuxgap2k/IqIqHA7 LJBQ== X-Gm-Message-State: AOAM530GAq152wltlRUSC/f8QEuIgzKND6ogQz8AisRQOoadDYD9m/fu wG04DtytvXEd6r3g1VH9mBj/q5AZToTqmm1jMz0= X-Google-Smtp-Source: ABdhPJwYROoGkGZt6KQvqFerbMfc/dR6YQlgj1tfJoNfTb3oio7K82/Z9zxbSyNhIVaJ2ZsmrfecyQ== X-Received: by 2002:a62:3812:0:b029:13e:d13d:a062 with SMTP id f18-20020a6238120000b029013ed13da062mr8718921pfa.40.1601761535153; Sat, 03 Oct 2020 14:45:35 -0700 (PDT) Received: from [192.168.0.104] ([49.207.217.69]) by smtp.gmail.com with ESMTPSA id y10sm6605367pfp.77.2020.10.03.14.45.30 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 03 Oct 2020 14:45:34 -0700 (PDT) Subject: Re: [PATCH v3] net: usb: rtl8150: set random MAC address when set_ethernet_addr() fails To: Joe Perches Cc: linux-kernel-mentees@lists.linuxfoundation.org, syzbot+abbc768b560c84d92fd3@syzkaller.appspotmail.com, Petko Manolov , "David S. Miller" , Jakub Kicinski , linux-usb@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org References: <20201003211931.11544-1-anant.thazhemadam@gmail.com> From: Anant Thazhemadam Message-ID: Date: Sun, 4 Oct 2020 03:15:29 +0530 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 8bit Content-Language: en-US Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org On 04/10/20 3:05 am, Joe Perches wrote: > On Sun, 2020-10-04 at 02:49 +0530, Anant Thazhemadam wrote: >> When get_registers() fails, in set_ethernet_addr(),the uninitialized >> value of node_id gets copied as the address. This can be considered as >> set_ethernet_addr() itself failing. > [] >> diff --git a/drivers/net/usb/rtl8150.c b/drivers/net/usb/rtl8150.c > [] >> @@ -909,7 +914,10 @@ static int rtl8150_probe(struct usb_interface *intf, >> goto out1; >> } >> fill_skb_pool(dev); >> - set_ethernet_addr(dev); >> + if (!set_ethernet_addr(dev)) { >> + dev_err(&intf->dev, "assigining a random MAC address\n"); >> + eth_hw_addr_random(dev->netdev); > 4 things: > . > o Typo for assigning Oh no. I'm sorry about that. > o Reverse the assignment and message to show the new random MAC Ah, okay. That would be more informative. > o This should use netdev_ Understood. > o Is this better as error or notification? > > if (!set_ethernet_addr(dev)) { > eth_hw_addr_random(dev->netdev); > netdev_notice(dev->netdev, "Assigned a random MAC: %pM\n", > dev->netdev->dev_addr); > } I thought it might be an error since set_ethernet_addr() did fail after all.  But making it info seems like a better idea, since technically speaking, the device is still made accessible. I'll wait for a day or two, to see if anybody else has any other comments, and send in a v4 incorporating these changes. Thanks, Anant