From patchwork Sat Oct 10 06:44:59 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Anant Thazhemadam X-Patchwork-Id: 11829833 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=-12.5 required=3.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED,DKIM_INVALID,DKIM_SIGNED,FREEMAIL_FORGED_FROMDOMAIN, FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,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 3FC55C433DF for ; Sat, 10 Oct 2020 06:45:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 00080207C4 for ; Sat, 10 Oct 2020 06:45:51 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="q2fd0Idi" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727698AbgJJGpb (ORCPT ); Sat, 10 Oct 2020 02:45:31 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34372 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725802AbgJJGpO (ORCPT ); Sat, 10 Oct 2020 02:45:14 -0400 Received: from mail-pf1-x441.google.com (mail-pf1-x441.google.com [IPv6:2607:f8b0:4864:20::441]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4920AC0613CF; Fri, 9 Oct 2020 23:45:14 -0700 (PDT) Received: by mail-pf1-x441.google.com with SMTP id e10so8763002pfj.1; Fri, 09 Oct 2020 23:45:14 -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=xfSdIY+23CT3/wQXlBcdzzU4V4XTk+/nKDZH0PbiNHM=; b=q2fd0Idi2WuzJrVO09Ukmf7rseVtkmEVEgXkG/5RZYMvMUdy9XwUbZVI7rjVYaxQQ5 u8Oy4QNnInXLUfNGlez7eCt2NuZUqDnnIXj26uYUNfEKmdaOLOQJHNPyIkjwSpwM/+yg vVXkTWeABrrr6AGcYZJ6KE4/oZhkHp5akR1EkM6QpMW6dWvQzx84xAlTvs7oi+cectqI fXU691erxXgiZ6dIeM8fTqagH5hlZDLyX3V+WWGgl2f0pNB4S08fXbLVbxUoWjWAZyJx tI6PN7UYd1Cr3ttmuxlMPg3eaFrpBPyzUEKKn2LWILPBAN/YqEGUQ1yG2DECQ4yJfUJp +F/Q== 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=xfSdIY+23CT3/wQXlBcdzzU4V4XTk+/nKDZH0PbiNHM=; b=Xdr3Py6EuSezVcnbQ6D2ALMX9XfVlW3MYZwhCF4LNdlhnqGzdjP1WwUmrd455MljV6 ylrrFh0QvMLqmLXq3nknvsimBzSi574ywluLHdWUqUujQroAo6FKLNE9tx7q2taJgBdQ 1dEfEzb14vkAaJIyafpj4ZsN+CbRa646s+RdWEhDGstQq4GIJQAANNWCKAOZzkS7XEJW isu3TYRSsPg8jRDZeBUg2FxoyAso+18C8p0kO4ZImcSaO0sQCFU0EDaALsuXE+S8JJBM jCgBJvD8uD0xWohzP8qsRazCC2fdCfcjFfa9yLuFrY1D7Pe8jVqswuPPiEsBZ0rvlztY 5WBA== X-Gm-Message-State: AOAM531CwDzLAw0zQbJALRPFrKLlNL4ZK/OddYgbnfGVIvJCYzFAmIcG +wFhd60sXb7hwb647JQyQYw= X-Google-Smtp-Source: ABdhPJxQ9ckge6Dkw/bNv402x14aKWItjXVRRQ/zAhILTY8a8R+FJKqwAPERSOX/98H89BtWIK6UpA== X-Received: by 2002:a62:105:0:b029:155:c7c0:3a81 with SMTP id 5-20020a6201050000b0290155c7c03a81mr634597pfb.34.1602312313405; Fri, 09 Oct 2020 23:45:13 -0700 (PDT) Received: from localhost.localdomain ([49.207.200.2]) by smtp.gmail.com with ESMTPSA id e2sm14219800pjw.13.2020.10.09.23.45.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 09 Oct 2020 23:45:12 -0700 (PDT) From: Anant Thazhemadam Cc: linux-kernel-mentees@lists.linuxfoundation.org, Anant Thazhemadam , Petko Manolov , "David S. Miller" , Jakub Kicinski , linux-usb@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] net: usb: rtl8150: don't incorrectly assign random MAC addresses Date: Sat, 10 Oct 2020 12:14:59 +0530 Message-Id: <20201010064459.6563-1-anant.thazhemadam@gmail.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 To: unlisted-recipients:; (no To-header on input) Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org get_registers() directly returns the return value of usb_control_msg_recv() - 0 if successful, and negative error number otherwise. However, in set_ethernet_addr(), this return value is incorrectly checked. Since this return value will never be equal to sizeof(node_id), a random MAC address will always be generated and assigned to the device; even in cases when get_registers() is successful. Correctly modifying the condition that checks if get_registers() was successful or not fixes this problem, and copies the ethernet address appropriately. Fixes: f45a4248ea4c ("set random MAC address when set_ethernet_addr() fails") Signed-off-by: Anant Thazhemadam --- drivers/net/usb/rtl8150.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/usb/rtl8150.c b/drivers/net/usb/rtl8150.c index f020401adf04..bf8a60533f3e 100644 --- a/drivers/net/usb/rtl8150.c +++ b/drivers/net/usb/rtl8150.c @@ -261,7 +261,7 @@ static void set_ethernet_addr(rtl8150_t *dev) ret = get_registers(dev, IDR, sizeof(node_id), node_id); - if (ret == sizeof(node_id)) { + if (!ret) { ether_addr_copy(dev->netdev->dev_addr, node_id); } else { eth_hw_addr_random(dev->netdev);