From: Richard Guy Briggs <rgb@redhat.com>
Date: Wed, 23 Apr 2014 01:31:58 +0000 (-0400)
Subject: audit: send multicast messages only if there are listeners
X-Git-Tag: v3.16-rc1~27^2~340^2
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=7f74ecd788a8b2a122d4d8bdc4d517cc60b8b638;p=platform%2Fkernel%2Flinux-exynos.git

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@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

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