From: Pablo Neira Ayuso <pablo@netfilter.org>
Date: Thu, 17 Sep 2015 11:37:00 +0000 (+0200)
Subject: netfilter: nf_log: wait for rcu grace after logger unregistration
X-Git-Tag: firefly_0821_release~176^2~1008^2~44^2
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=ad5001cc7cdf9aaee5eb213fdee657e4a3c94776;p=firefly-linux-kernel-4.4.55.git

netfilter: nf_log: wait for rcu grace after logger unregistration

The nf_log_unregister() function needs to call synchronize_rcu() to make sure
that the objects are not dereferenced anymore on module removal.

Fixes: 5962815a6a56 ("netfilter: nf_log: use an array of loggers instead of list")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---

diff --git a/net/netfilter/nf_log.c b/net/netfilter/nf_log.c
index a5ebd7d9c472..a5d41dfa9f05 100644
--- a/net/netfilter/nf_log.c
+++ b/net/netfilter/nf_log.c
@@ -117,6 +117,7 @@ void nf_log_unregister(struct nf_logger *logger)
 			RCU_INIT_POINTER(loggers[i][logger->type], NULL);
 	}
 	mutex_unlock(&nf_log_mutex);
+	synchronize_rcu();
 }
 EXPORT_SYMBOL(nf_log_unregister);