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=-9.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,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 154B6C55179 for ; Tue, 27 Oct 2020 14:03:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C844322281 for ; Tue, 27 Oct 2020 14:03:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1603807405; bh=Pws3rXy4+Pl2oRWHUfWVZr2+vaWb8828Xb9HtE2AV0k=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=fgA4Gnrbv71Z2GyavXaR/DVMFc4TruGeZE/vTCQdkLjn/Ctkw+Jvcd6rHsFU6/i3y Q1oauaetJA+eXjU2LrpSfyDXtrYtd0mPAHHrL/q3f2Wk1G+k2TUMxBn6YNBZn0dJXT /xaQ9z8FCCpz5nUVVH8W3JG/4DT6PMwN3g6xhLLk= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753979AbgJ0ODW (ORCPT ); Tue, 27 Oct 2020 10:03:22 -0400 Received: from mail.kernel.org ([198.145.29.99]:51352 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1740129AbgJ0ODN (ORCPT ); Tue, 27 Oct 2020 10:03:13 -0400 Received: from localhost (83-86-74-64.cable.dynamic.v4.ziggo.nl [83.86.74.64]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 404EE22263; Tue, 27 Oct 2020 14:03:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1603807392; bh=Pws3rXy4+Pl2oRWHUfWVZr2+vaWb8828Xb9HtE2AV0k=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=VIw+WSRNOfvTjTsYxJaGOruTZHrDkTwriyuC8XC9y+85xHpJMA8C1jB4OxsIGgfZk gXhnegW+uUtxVAfLUQ5GZUJVLbYo7ap3MX47xtGP1mV+g51Kgieaf/hchSN0pHbsxS WX9/ekgiGstqnHfXUzY4qCDZBU6GJG/N3rh1HKBU= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Neil Horman , Krzysztof Halasa , Xie He , Jakub Kicinski Subject: [PATCH 4.9 007/139] net: hdlc_raw_eth: Clear the IFF_TX_SKB_SHARING flag after calling ether_setup Date: Tue, 27 Oct 2020 14:48:21 +0100 Message-Id: <20201027134902.495688403@linuxfoundation.org> X-Mailer: git-send-email 2.29.1 In-Reply-To: <20201027134902.130312227@linuxfoundation.org> References: <20201027134902.130312227@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Xie He [ Upstream commit 5fce1e43e2d5bf2f7e3224d7b99b1c65ab2c26e2 ] 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. Fixes: 550fd08c2ceb ("net: Audit drivers to identify those needing IFF_TX_SKB_SHARING cleared") Cc: Neil Horman Cc: Krzysztof Halasa Signed-off-by: Xie He Link: https://lore.kernel.org/r/20201020063420.187497-1-xie.he.0141@gmail.com Signed-off-by: Jakub Kicinski Signed-off-by: Greg Kroah-Hartman --- drivers/net/wan/hdlc_raw_eth.c | 1 + 1 file changed, 1 insertion(+) --- a/drivers/net/wan/hdlc_raw_eth.c +++ b/drivers/net/wan/hdlc_raw_eth.c @@ -101,6 +101,7 @@ static int raw_eth_ioctl(struct net_devi 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);