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

[Richard Guy Briggs]

From: Richard Guy Briggs <rgb@xxxxxxxxxx>

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 <rbriggs@xxxxxxxxxx>
---
 kernel/audit.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/audit.c b/kernel/audit.c
index 9eef05b..d153a6b 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -428,6 +428,8 @@ static void kauditd_send_multicast_skb(struct sk_buff *skb)
 	struct sk_buff *copy;
 	struct nlmsghdr *nlh;
 
+	if (!netlink_has_listeners(audit_sock, AUDIT_NLGRP_READLOG))
+		return;
 	/*
 	 * The seemingly wasteful skb_copy() is necessary because the original
 	 * kaudit unicast socket sends up messages with nlmsg_len set to the
-- 
1.8.0.2

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