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=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 8BC1CC388F9 for ; Tue, 27 Oct 2020 13:57:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4DC6621D41 for ; Tue, 27 Oct 2020 13:57:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1603807023; bh=Y0LEP7xtmW9aZ9+uKOXS1UM96fe9IIZEIvUNvxHAsuQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=SwkR8N37/QTeC+JCkgMCWWH7f3vTr0v/pK2wJMJqJOTFeENv8S0yCSDYwEG60zKg4 eN+CpOoQXzUhkSql/HEdPtmfcp+PHlO0hJ8TFn6U4wZW09tfl9QAcNvpC/+clyXPBY sqWwU7PEA93Qpp5TaZs1BeF5LUcB0ffa47aAigzk= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S368127AbgJ0N5B (ORCPT ); Tue, 27 Oct 2020 09:57:01 -0400 Received: from mail.kernel.org ([198.145.29.99]:43420 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S368116AbgJ0N47 (ORCPT ); Tue, 27 Oct 2020 09:56:59 -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 83C462074B; Tue, 27 Oct 2020 13:56:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1603807019; bh=Y0LEP7xtmW9aZ9+uKOXS1UM96fe9IIZEIvUNvxHAsuQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=YDeIA9ErhYNxHWs5oZU7fvFxNvrPkpwOvurA0ID0R6lblV+yfNmLqsHCtrRpY9+Nq CIhtcV4VuorRYAkS76+yByXyfIWHbskJeGVs6775F0GJmf7o+e5rOpBAsLEG7S9o6k dCcMQUSYJg5ISTP+BYt0JXbTnER8uQgtsq5YUEr4= 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 4.4 013/112] net: hdlc_raw_eth: Clear the IFF_TX_SKB_SHARING flag after calling ether_setup Date: Tue, 27 Oct 2020 14:48:43 +0100 Message-Id: <20201027134901.188343674@linuxfoundation.org> X-Mailer: git-send-email 2.29.1 In-Reply-To: <20201027134900.532249571@linuxfoundation.org> References: <20201027134900.532249571@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); netif_dormant_off(dev); return 0;