From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754850AbbJ0VuT (ORCPT ); Tue, 27 Oct 2015 17:50:19 -0400 Received: from youngberry.canonical.com ([91.189.89.112]:35145 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754451AbbJ0VbW (ORCPT ); Tue, 27 Oct 2015 17:31:22 -0400 From: Kamal Mostafa To: linux-kernel@vger.kernel.org, stable@vger.kernel.org, kernel-team@lists.ubuntu.com Cc: Florian Westphal , Pablo Neira Ayuso , Kamal Mostafa Subject: [PATCH 3.19.y-ckt 79/86] netfilter: nf_log: don't zap all loggers on unregister Date: Tue, 27 Oct 2015 14:30:19 -0700 Message-Id: <1445981426-19727-80-git-send-email-kamal@canonical.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1445981426-19727-1-git-send-email-kamal@canonical.com> References: <1445981426-19727-1-git-send-email-kamal@canonical.com> X-Extended-Stable: 3.19 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.19.8-ckt9 -stable review patch. If anyone has any objections, please let me know. ------------------ From: Florian Westphal commit 205ee117d4dc4a11ac3bd9638bb9b2e839f4de9a upstream. like nf_log_unset, nf_log_unregister must not reset the list of loggers. Otherwise, a call to nf_log_unregister() will render loggers of other nf protocols unusable: iptables -A INPUT -j LOG modprobe nf_log_arp ; rmmod nf_log_arp iptables -A INPUT -j LOG iptables: No chain/target/match by that name Fixes: 30e0c6a6be ("netfilter: nf_log: prepare net namespace support for loggers") Signed-off-by: Florian Westphal Signed-off-by: Pablo Neira Ayuso Signed-off-by: Kamal Mostafa --- net/netfilter/nf_log.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/net/netfilter/nf_log.c b/net/netfilter/nf_log.c index 7ea79a2..58ebbf5 100644 --- a/net/netfilter/nf_log.c +++ b/net/netfilter/nf_log.c @@ -107,11 +107,15 @@ EXPORT_SYMBOL(nf_log_register); void nf_log_unregister(struct nf_logger *logger) { + const struct nf_logger *log; int i; mutex_lock(&nf_log_mutex); - for (i = 0; i < NFPROTO_NUMPROTO; i++) - RCU_INIT_POINTER(loggers[i][logger->type], NULL); + for (i = 0; i < NFPROTO_NUMPROTO; i++) { + log = nft_log_dereference(loggers[i][logger->type]); + if (log == logger) + RCU_INIT_POINTER(loggers[i][logger->type], NULL); + } mutex_unlock(&nf_log_mutex); synchronize_rcu(); } -- 1.9.1