From patchwork Fri May 8 12:33:05 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 226252 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, 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 EBC96C38A2A for ; Fri, 8 May 2020 12:45:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CE8CD21974 for ; Fri, 8 May 2020 12:45:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1588941946; bh=kt3yg/PQJQCoDNeJE8s644Q/i648VVi5QUmWT08wOsM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=xui7TFOXBGZ/7EW58F5J0TIz/6a+DSuE0Z3RY+1lrzh1RF6nYG+GNKm+TSseNUXrQ MG5thnirePjoGs8+MBdVZaVWvJ3wCYrgLCShgwLxJj0vcjw3VH92nB6i49+ZAh4O1i jXi1m0c7P+R1bVIowCSQH6ynQib/dMbfXyDC0i9g= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728953AbgEHMpp (ORCPT ); Fri, 8 May 2020 08:45:45 -0400 Received: from mail.kernel.org ([198.145.29.99]:45682 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729329AbgEHMpl (ORCPT ); Fri, 8 May 2020 08:45:41 -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 874C02145D; Fri, 8 May 2020 12:45:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1588941941; bh=kt3yg/PQJQCoDNeJE8s644Q/i648VVi5QUmWT08wOsM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=bZHlEroRK8fsrnuiIiIBu4TM3pMMdC2OzqnG7UigFKw6ugPIMIM1N+ZMfapyRjnMZ GTJAAClEHvW+gJND5hQwXMPh2RMinBrq8JVlMFj1SYdHubC3yyvEV7LI8nNXcXgXX3 m+VDcX74lovYUp9vl9xqZrYfuiZqApqZGpJ+cbwE= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Eric Dumazet , Nicolas Dichtel , "David S. Miller" Subject: [PATCH 4.4 194/312] ipv6: do not abuse GFP_ATOMIC in inet6_netconf_notify_devconf() Date: Fri, 8 May 2020 14:33:05 +0200 Message-Id: <20200508123138.093150659@linuxfoundation.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200508123124.574959822@linuxfoundation.org> References: <20200508123124.574959822@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Eric Dumazet commit 927265bc6cd6374c9bafc43408ece4e92311b149 upstream. All inet6_netconf_notify_devconf() callers are in process context, so we can use GFP_KERNEL allocations if we take care of not holding a rwlock while not needed in ip6mr (we hold RTNL there) Fixes: d67b8c616b48 ("netconf: advertise mc_forwarding status") Fixes: f3a1bfb11ccb ("rtnl/ipv6: use netconf msg to advertise forwarding status") Signed-off-by: Eric Dumazet Cc: Nicolas Dichtel Acked-by: Nicolas Dichtel Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- net/ipv6/addrconf.c | 4 ++-- net/ipv6/ip6mr.c | 13 +++++++------ 2 files changed, 9 insertions(+), 8 deletions(-) --- a/net/ipv6/addrconf.c +++ b/net/ipv6/addrconf.c @@ -540,7 +540,7 @@ void inet6_netconf_notify_devconf(struct struct sk_buff *skb; int err = -ENOBUFS; - skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC); + skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL); if (!skb) goto errout; @@ -552,7 +552,7 @@ void inet6_netconf_notify_devconf(struct kfree_skb(skb); goto errout; } - rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC); + rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL); return; errout: rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err); --- a/net/ipv6/ip6mr.c +++ b/net/ipv6/ip6mr.c @@ -1594,14 +1594,15 @@ static int ip6mr_sk_init(struct mr6_tabl if (likely(mrt->mroute6_sk == NULL)) { mrt->mroute6_sk = sk; net->ipv6.devconf_all->mc_forwarding++; - inet6_netconf_notify_devconf(net, NETCONFA_MC_FORWARDING, - NETCONFA_IFINDEX_ALL, - net->ipv6.devconf_all); - } - else + } else { err = -EADDRINUSE; + } write_unlock_bh(&mrt_lock); + if (!err) + inet6_netconf_notify_devconf(net, NETCONFA_MC_FORWARDING, + NETCONFA_IFINDEX_ALL, + net->ipv6.devconf_all); rtnl_unlock(); return err; @@ -1619,11 +1620,11 @@ int ip6mr_sk_done(struct sock *sk) write_lock_bh(&mrt_lock); mrt->mroute6_sk = NULL; net->ipv6.devconf_all->mc_forwarding--; + write_unlock_bh(&mrt_lock); inet6_netconf_notify_devconf(net, NETCONFA_MC_FORWARDING, NETCONFA_IFINDEX_ALL, net->ipv6.devconf_all); - write_unlock_bh(&mrt_lock); mroute_clean_tables(mrt, false); err = 0;