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=-9.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,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 387B2C48BD6 for ; Thu, 27 Jun 2019 00:41:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1011021881 for ; Thu, 27 Jun 2019 00:41:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1561596113; bh=InIDW00RUkirh/J5pgEUul3acAmgbBcoF5Q5xM3H0D4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=KEtUJvmQDqDKO8c1InohURf7QzUxxWs0pnWIhvtsI3jk2SaKYcg+fTS2gWEK3ax5m 2JFVW0bcdWglgg+Y6GloppIZS0emFUuZbifcCJZ2bMLmal9XxhxVLfk4BeKp3/X5UR oWlezxRpTyPbB4KO/j2kLA9LndqXiHLGHCQIB+Vk= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729179AbfF0Alw (ORCPT ); Wed, 26 Jun 2019 20:41:52 -0400 Received: from mail.kernel.org ([198.145.29.99]:45554 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729577AbfF0Alu (ORCPT ); Wed, 26 Jun 2019 20:41:50 -0400 Received: from sasha-vm.mshome.net (unknown [107.242.116.147]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 9203E21881; Thu, 27 Jun 2019 00:41:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1561596110; bh=InIDW00RUkirh/J5pgEUul3acAmgbBcoF5Q5xM3H0D4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ZxstcwcWXSj8A5EZNZ+KzMNbLXd5uW20RXM8FFB4h6uoMc1fAccKs0BSQCbkt0osj 0Dq9iRqVATR4l99XVWGh9CCBXH78eaRzFc9obzQ+AAM50GrNaHjonBRES4F/F5X9pK cm1gCc+dTUQbOYXuFuV/uG+OCgTk3+oBKBZFMuns= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Guillaume Nault , Pablo Neira Ayuso , Sasha Levin , netfilter-devel@vger.kernel.org, coreteam@netfilter.org, netdev@vger.kernel.org Subject: [PATCH AUTOSEL 4.9 08/21] netfilter: ipv6: nf_defrag: fix leakage of unqueued fragments Date: Wed, 26 Jun 2019 20:41:08 -0400 Message-Id: <20190627004122.21671-8-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190627004122.21671-1-sashal@kernel.org> References: <20190627004122.21671-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Guillaume Nault [ Upstream commit a0d56cb911ca301de81735f1d73c2aab424654ba ] With commit 997dd9647164 ("net: IP6 defrag: use rbtrees in nf_conntrack_reasm.c"), nf_ct_frag6_reasm() is now called from nf_ct_frag6_queue(). With this change, nf_ct_frag6_queue() can fail after the skb has been added to the fragment queue and nf_ct_frag6_gather() was adapted to handle this case. But nf_ct_frag6_queue() can still fail before the fragment has been queued. nf_ct_frag6_gather() can't handle this case anymore, because it has no way to know if nf_ct_frag6_queue() queued the fragment before failing. If it didn't, the skb is lost as the error code is overwritten with -EINPROGRESS. Fix this by setting -EINPROGRESS directly in nf_ct_frag6_queue(), so that nf_ct_frag6_gather() can propagate the error as is. Fixes: 997dd9647164 ("net: IP6 defrag: use rbtrees in nf_conntrack_reasm.c") Signed-off-by: Guillaume Nault Signed-off-by: Pablo Neira Ayuso Signed-off-by: Sasha Levin --- net/ipv6/netfilter/nf_conntrack_reasm.c | 12 +++++------- 1 file changed, 5 insertions(+), 7 deletions(-) diff --git a/net/ipv6/netfilter/nf_conntrack_reasm.c b/net/ipv6/netfilter/nf_conntrack_reasm.c index 1e1fa99b3243..e6114a6710e0 100644 --- a/net/ipv6/netfilter/nf_conntrack_reasm.c +++ b/net/ipv6/netfilter/nf_conntrack_reasm.c @@ -292,7 +292,11 @@ static int nf_ct_frag6_queue(struct frag_queue *fq, struct sk_buff *skb, skb->_skb_refdst = 0UL; err = nf_ct_frag6_reasm(fq, skb, prev, dev); skb->_skb_refdst = orefdst; - return err; + + /* After queue has assumed skb ownership, only 0 or + * -EINPROGRESS must be returned. + */ + return err ? -EINPROGRESS : 0; } skb_dst_drop(skb); @@ -480,12 +484,6 @@ int nf_ct_frag6_gather(struct net *net, struct sk_buff *skb, u32 user) ret = 0; } - /* after queue has assumed skb ownership, only 0 or -EINPROGRESS - * must be returned. - */ - if (ret) - ret = -EINPROGRESS; - spin_unlock_bh(&fq->q.lock); inet_frag_put(&fq->q); return ret; -- 2.20.1