From patchwork Sat Oct 3 21:19:31 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Anant Thazhemadam X-Patchwork-Id: 297394 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,URIBL_BLOCKED,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 C6927C47095 for ; Sat, 3 Oct 2020 21:20:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 85E99206C1 for ; Sat, 3 Oct 2020 21:20:20 +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="uW8S+Fcu" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725947AbgJCVUP (ORCPT ); Sat, 3 Oct 2020 17:20:15 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56426 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725897AbgJCVUP (ORCPT ); Sat, 3 Oct 2020 17:20:15 -0400 Received: from mail-pj1-x1044.google.com (mail-pj1-x1044.google.com [IPv6:2607:f8b0:4864:20::1044]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9F44DC0613D0; Sat, 3 Oct 2020 14:20:15 -0700 (PDT) Received: by mail-pj1-x1044.google.com with SMTP id kk9so3031551pjb.2; Sat, 03 Oct 2020 14:20:15 -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=snQrsKK9wGUFakYFc3REQ5zRMVVl45uxLHEVZUf1zPE=; b=uW8S+Fcu7cIrW1qdaLgGVCTcAXyZtwcLuuFHOuASPkpEY5tMlqyE2xZEsr+U7O7jnU /oPYqWZ019qoXJ2N8XTHDr2274AVt/GhmPhdV7pPp07oYF2PRtQlignkwNwcUvY/pWI8 7QOdpol5oWv2i/+dIP77XbIiuWVLwPYfpI8fzoPiuscI2GXfNIyuYgpfbs6xG/ThizmK wonsMN9Bdc4ZanBrm0TLxpQe8RMyMGb4FOc2s2PrhmGqYUsE7pDlRPIOIFCF3QvEeMEh rojF6mDqPIpfDhdfk7OtAC6hct9CwhFiy8EGAR8m+p2/9LiU6Q9aAXapS8JQWHbA7SoO OJIg== 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=snQrsKK9wGUFakYFc3REQ5zRMVVl45uxLHEVZUf1zPE=; b=TLfUFKv4majQaAxxd+Mz5WdJh4sipRi1Tftr5TlauH3BIrIxM6Eh6J9hS6vvAIt/5p L9smz3O+PKfMxaioNc1qtKSlAKPAoJZI/j+SUg5iPJsgG5e9mqqxWpTGABZA/u7/RPE+ xILs25/LqHCBces/zA0Y/uZ4I273qbRd/4w7KlHEGNVcMABtrp96lIUCC6AC3ILqfo9w skSXedPLIkp+mUg+id+q25Jo+skkkffJ1JlwHUMz7wb90IlHP93fulCp35Nnqeju2fRe OX3NoWtOiyKRGblt4mGEv3Zu62CWkCHw1vyCc3W/jjrvrrM28bABARNQEOAuMxcxuZQD jftg== X-Gm-Message-State: AOAM532S+l96T9OOMe8EWINls9GOMICeNwC1M4nzMT40YhY1urLzwfa9 9JzgUoPVRtrIX/XBWhD5IGU= X-Google-Smtp-Source: ABdhPJxu6wgoODYD1L249tBKjrit5dqjZ8vAWqt9NDnX4FUgsb5CwVv9+fEdutwq+r/QCMsLlyhyJQ== X-Received: by 2002:a17:90a:128d:: with SMTP id g13mr9016097pja.35.1601760014082; Sat, 03 Oct 2020 14:20:14 -0700 (PDT) Received: from localhost.localdomain ([49.207.217.69]) by smtp.gmail.com with ESMTPSA id u8sm2406380pfk.79.2020.10.03.14.20.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 03 Oct 2020 14:20:13 -0700 (PDT) From: Anant Thazhemadam Cc: linux-kernel-mentees@lists.linuxfoundation.org, joe@perches.com, Anant Thazhemadam , 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 Subject: [PATCH v3] net: usb: rtl8150: set random MAC address when set_ethernet_addr() fails Date: Sun, 4 Oct 2020 02:49:31 +0530 Message-Id: <20201003211931.11544-1-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: linux-usb@vger.kernel.org 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. The return type of set_ethernet_addr() is modified to indicate if it failed or not, and return values are appropriately checked by caller. When set_ethernet_addr() fails, a randomly generated MAC address is set as the MAC address instead. On the other hand, for the case when get_registers() does succeed, set_ethernet_addr() has been updated to use ether_addr_copy() to copy the address, instead of memcpy(). Reported-by: syzbot+abbc768b560c84d92fd3@syzkaller.appspotmail.com Tested-by: syzbot+abbc768b560c84d92fd3@syzkaller.appspotmail.com Acked-by: Petko Manolov Signed-off-by: Anant Thazhemadam --- Changes in v3: * Set a random MAC address to the device rather than making the device not work at all in the even set_ethernet_addr() fails. (Suggested by David Miller ) * Update set_ethernet_addr() to use ether_addr_copy() to copy the MAC Address (instead of using memcpy() for that same). (Suggested by Joe Perches ) Changes in v2: * Modified condition checking get_registers()'s return value to ret == sizeof(node_id) for stricter checking in compliance with the new usb_control_msg_recv() API * Added Acked-by: Petko Manolov drivers/net/usb/rtl8150.c | 18 +++++++++++++----- 1 file changed, 13 insertions(+), 5 deletions(-) diff --git a/drivers/net/usb/rtl8150.c b/drivers/net/usb/rtl8150.c index 733f120c852b..bbd49ebdf095 100644 --- a/drivers/net/usb/rtl8150.c +++ b/drivers/net/usb/rtl8150.c @@ -274,12 +274,17 @@ static int write_mii_word(rtl8150_t * dev, u8 phy, __u8 indx, u16 reg) return 1; } -static inline void set_ethernet_addr(rtl8150_t * dev) +static bool set_ethernet_addr(rtl8150_t *dev) { - u8 node_id[6]; + u8 node_id[ETH_ALEN]; + int ret; - get_registers(dev, IDR, sizeof(node_id), node_id); - memcpy(dev->netdev->dev_addr, node_id, sizeof(node_id)); + ret = get_registers(dev, IDR, sizeof(node_id), node_id); + if (ret == sizeof(node_id)) { + ether_addr_copy(dev->netdev->dev_addr, node_id); + return true; + } + return false; } static int rtl8150_set_mac_address(struct net_device *netdev, void *p) @@ -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); + } usb_set_intfdata(intf, dev); SET_NETDEV_DEV(netdev, &intf->dev);