From: Florian Westphal <fw@strlen.de>
To: <netfilter-devel@vger.kernel.org>
Cc: Florian Westphal <fw@strlen.de>
Subject: [PATCH nf] netfilter: nf_log: don't zap all loggers on unregister
Date: Wed, 9 Sep 2015 02:57:21 +0200 [thread overview]
Message-ID: <1441760241-3220-1-git-send-email-fw@strlen.de> (raw)
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 <fw@strlen.de>
---
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 675d12c..a5ebd7d 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);
}
EXPORT_SYMBOL(nf_log_unregister);
--
2.0.5
next reply other threads:[~2015-09-09 0:58 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-09 0:57 Florian Westphal [this message]
2015-09-14 12:50 ` [PATCH nf] netfilter: nf_log: don't zap all loggers on unregister Pablo Neira Ayuso
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