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audit: send multicast messages only if there are listeners

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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>
This commit is contained in:
Richard Guy Briggs 2014-04-22 21:31:58 -04:00 committed by David S. Miller
parent 451f921639
commit 7f74ecd788
1 changed files with 3 additions and 0 deletions
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3
kernel/audit.c
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@ -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