netdev - [PATCH 6/6][v2] audit: send multicast messages only if there are listeners

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Date:	Tue, 22 Apr 2014 21:31:58 -0400
From:	Richard Guy Briggs <rgb@...hat.com>
To:	linux-audit@...hat.com, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, selinux@...ho.nsa.gov,
	linux-security-module@...r.kernel.org
Cc:	Richard Guy Briggs <rgb@...hat.com>, davem@...emloft.net,
	jamal@...atatu.com, eparis@...hat.com, sgrubb@...hat.com
Subject: [PATCH 6/6][v2] audit: send multicast messages only if there are listeners

Test first to see if there are any userspace multicast listeners bound to the
socket before starting the multicast send work.

Signed-off-by: Richard Guy Briggs <rgb@...hat.com>
---
 kernel/audit.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/kernel/audit.c b/kernel/audit.c
index d272cc1..33531d7 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -435,6 +435,9 @@ static void kauditd_send_multicast_skb(struct sk_buff *skb)
 	struct audit_net	*aunet = net_generic(&init_net, audit_net_id);
 	struct sock		*sock = aunet->nlsk;
 
+	if (!netlink_has_listeners(sock, AUDIT_NLGRP_READLOG))
+		return;
+
 	/*
 	 * The seemingly wasteful skb_copy() rather than bumping the refcount
 	 * using skb_get() is necessary because non-standard mods are made to
-- 
1.7.1

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