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=-6.8 required=3.0 tests=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 3A96BC433FF for ; Fri, 2 Aug 2019 09:48:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 14CA02086A for ; Fri, 2 Aug 2019 09:48:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1564739316; bh=A8kKjbFSnEC+/QBKfFa7P86LKhVsYi0K7r+xJTwSqLM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=SgRkB85FTKrEYQj25DYiVatdf4iH/MC2W4JRDMHQAG6uPd97nXXj6kw30wJxqfJgw QG9TXPXKQ2o/IyVYIE0QfXIgL+AYOx9mBJ/onPZ6Ahx1fpXXWGplLza3p3dvi8cKY9 qOWGwdJpR/EiSYVag2j8YcXdo4fZMgK6q+Rzv3LE= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2405242AbfHBJsf (ORCPT ); Fri, 2 Aug 2019 05:48:35 -0400 Received: from mail.kernel.org ([198.145.29.99]:52954 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2405752AbfHBJrz (ORCPT ); Fri, 2 Aug 2019 05:47:55 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (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 02E8B2086A; Fri, 2 Aug 2019 09:47:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1564739274; bh=A8kKjbFSnEC+/QBKfFa7P86LKhVsYi0K7r+xJTwSqLM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=UVxj8BTTh+ol0OuL1YyleSdsLQssQYmw/1yhvPBhVI8w/rBO0AJNCMDuB32kCOcoM Rqwu+2BN0M+/QVRLu2Vh5oTKRBBJYsxvc4a6htxDrIW9C61yHIdYiQ5hp0dIHhfMwW 6CUGp3kqZwBd3Ia3k3G2oOOzzWGlW6zlQD7L8QVI= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Jay Vosburgh , Veaceslav Falico , Andy Gospodarek , Cong Wang , "David S. Miller" , syzbot+e5be16aa39ad6e755391@syzkaller.appspotmail.com Subject: [PATCH 4.9 146/223] bonding: validate ip header before check IPPROTO_IGMP Date: Fri, 2 Aug 2019 11:36:11 +0200 Message-Id: <20190802092248.052256687@linuxfoundation.org> X-Mailer: git-send-email 2.22.0 In-Reply-To: <20190802092238.692035242@linuxfoundation.org> References: <20190802092238.692035242@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Cong Wang [ Upstream commit 9d1bc24b52fb8c5d859f9a47084bf1179470e04c ] bond_xmit_roundrobin() checks for IGMP packets but it parses the IP header even before checking skb->protocol. We should validate the IP header with pskb_may_pull() before using iph->protocol. Reported-and-tested-by: syzbot+e5be16aa39ad6e755391@syzkaller.appspotmail.com Fixes: a2fd940f4cff ("bonding: fix broken multicast with round-robin mode") Cc: Jay Vosburgh Cc: Veaceslav Falico Cc: Andy Gospodarek Signed-off-by: Cong Wang Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- drivers/net/bonding/bond_main.c | 37 +++++++++++++++++++++++-------------- 1 file changed, 23 insertions(+), 14 deletions(-) --- a/drivers/net/bonding/bond_main.c +++ b/drivers/net/bonding/bond_main.c @@ -3788,8 +3788,8 @@ static u32 bond_rr_gen_slave_id(struct b static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev) { struct bonding *bond = netdev_priv(bond_dev); - struct iphdr *iph = ip_hdr(skb); struct slave *slave; + int slave_cnt; u32 slave_id; /* Start with the curr_active_slave that joined the bond as the @@ -3798,23 +3798,32 @@ static int bond_xmit_roundrobin(struct s * send the join/membership reports. The curr_active_slave found * will send all of this type of traffic. */ - if (iph->protocol == IPPROTO_IGMP && skb->protocol == htons(ETH_P_IP)) { - slave = rcu_dereference(bond->curr_active_slave); - if (slave) - bond_dev_queue_xmit(bond, skb, slave->dev); - else - bond_xmit_slave_id(bond, skb, 0); - } else { - int slave_cnt = ACCESS_ONCE(bond->slave_cnt); + if (skb->protocol == htons(ETH_P_IP)) { + int noff = skb_network_offset(skb); + struct iphdr *iph; + + if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph)))) + goto non_igmp; - if (likely(slave_cnt)) { - slave_id = bond_rr_gen_slave_id(bond); - bond_xmit_slave_id(bond, skb, slave_id % slave_cnt); - } else { - bond_tx_drop(bond_dev, skb); + iph = ip_hdr(skb); + if (iph->protocol == IPPROTO_IGMP) { + slave = rcu_dereference(bond->curr_active_slave); + if (slave) + bond_dev_queue_xmit(bond, skb, slave->dev); + else + bond_xmit_slave_id(bond, skb, 0); + return NETDEV_TX_OK; } } +non_igmp: + slave_cnt = ACCESS_ONCE(bond->slave_cnt); + if (likely(slave_cnt)) { + slave_id = bond_rr_gen_slave_id(bond); + bond_xmit_slave_id(bond, skb, slave_id % slave_cnt); + } else { + bond_tx_drop(bond_dev, skb); + } return NETDEV_TX_OK; }