From patchwork Tue Oct 20 06:34:20 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xie He X-Patchwork-Id: 298770 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=-12.6 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, 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 539E6C43457 for ; Tue, 20 Oct 2020 06:34:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E264D22283 for ; Tue, 20 Oct 2020 06:34:31 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="RSblhhQ9" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2404341AbgJTGe2 (ORCPT ); Tue, 20 Oct 2020 02:34:28 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51076 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730776AbgJTGe2 (ORCPT ); Tue, 20 Oct 2020 02:34:28 -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 28B27C061755; Mon, 19 Oct 2020 23:34:27 -0700 (PDT) Received: by mail-pf1-x442.google.com with SMTP id 144so608519pfb.4; Mon, 19 Oct 2020 23:34:27 -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=88n0uu/xuS20DKfdAem15q9rKph9xB77+Uoiqz9GArQ=; b=RSblhhQ9DLB+Nd3my50b/lKvgi5pp4/l16rpC060pEtzVCDVCK/kQgMGxcuemqqoLQ uDMEVs3e1e+5bTFoGphjr16gdHwccbhNDQ8/ogxx7fwQl5aZzlixiEsQ/9W8B5Po9ij/ WV6W+S5p+KuP9pFOAbNgpLifCXFSOZQg+1jKUGYgkilzEnY0ppLrFTqqMXqvderoOzTT /VXkXvaCZbT2jlDogYgjeSPosrrvetDVcJ48B/1oPniCVrJJXqOPDo2xlXj7TnBJf3XZ 0Y1kylKfcTS5sljLLQh75vRNL2n/+9qQh2d/oQPJu6LaKplO1kN8oWHg9Vt6k5RSvMaQ wRNQ== 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=88n0uu/xuS20DKfdAem15q9rKph9xB77+Uoiqz9GArQ=; b=Dmuerc/fiRUiPR03AfY/uCFPY1wAfC/0QakPMKoc8BHv7q2ZfMPrkHHNn82zv/bq9I 2HR4JggTwWTBdmHmJcqGMN0a9IvOq6SbQDu8j93L9Xx6Foo2wBxrySfFSzv0HBSZf7Um OFuFvu3SgcwI2nixggYHoUTO2AxbRlpz5TcdefsUiGvh/pio6M2iTWo2vwSzlJD5V1+z XTPWv9kyiW3Bajt4YoGSKpALnRjPBf5CDnVG0tiwUpL/FUiYIhd6cMsvRiro8EAzUeHK cUfJTX+RbGie4+9RkRjSQBLPj/UZigzqvvoMeQSNt+xeOSoNwetmLoljUigM7a8ImTeo V94A== X-Gm-Message-State: AOAM531E5eknn7nY20pVnv9rAgJ8bC9ih9HzeXddeNoKPumclJxwr6tq 0SqqL7gmbqHPOSenlJPRsqh8y0WjqII= X-Google-Smtp-Source: ABdhPJwCBUpOn5ELeqqcSyeRUEzrSxyoot7K8BwTlJMp3G6jWmU7XKnHLdcRCMW5kLp5OqHfg32vpw== X-Received: by 2002:a62:144d:0:b029:157:7e01:94a5 with SMTP id 74-20020a62144d0000b02901577e0194a5mr1446261pfu.56.1603175666695; Mon, 19 Oct 2020 23:34:26 -0700 (PDT) Received: from shane-XPS-13-9380.hsd1.ca.comcast.net ([2601:646:8800:1c00:6caa:ebf2:3bbb:f04e]) by smtp.gmail.com with ESMTPSA id ha24sm776992pjb.27.2020.10.19.23.34.25 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 19 Oct 2020 23:34:26 -0700 (PDT) From: Xie He To: Jakub Kicinski , "David S. Miller" , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Neil Horman , Krzysztof Halasa Cc: Xie He Subject: [PATCH net] net: hdlc_raw_eth: Clear the IFF_TX_SKB_SHARING flag after calling ether_setup Date: Mon, 19 Oct 2020 23:34:20 -0700 Message-Id: <20201020063420.187497-1-xie.he.0141@gmail.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org This driver calls ether_setup to set up the network device. The ether_setup function would add the IFF_TX_SKB_SHARING flag to the device. This flag indicates that it is safe to transmit shared skbs to the device. However, this is not true. This driver may pad the frame (in eth_tx) before transmission, so the skb may be modified. Cc: Neil Horman Cc: Krzysztof Halasa Signed-off-by: Xie He --- drivers/net/wan/hdlc_raw_eth.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/net/wan/hdlc_raw_eth.c b/drivers/net/wan/hdlc_raw_eth.c index 08e0a46501de..c70a518b8b47 100644 --- a/drivers/net/wan/hdlc_raw_eth.c +++ b/drivers/net/wan/hdlc_raw_eth.c @@ -99,6 +99,7 @@ static int raw_eth_ioctl(struct net_device *dev, struct ifreq *ifr) old_qlen = dev->tx_queue_len; ether_setup(dev); dev->tx_queue_len = old_qlen; + dev->priv_flags &= ~IFF_TX_SKB_SHARING; eth_hw_addr_random(dev); call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, dev); netif_dormant_off(dev);