[PATCH 5/5] audit: send multicast messages only if there are listeners

[Richard Guy Briggs]

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 at redhat.com>
---
 kernel/audit.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/kernel/audit.c b/kernel/audit.c
index 0da57b6..6e8d137 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -434,6 +434,8 @@ 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
-- 
1.7.1