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--- iptables-1.2.9/libipq/libipq.c.netlink	2003-12-05 17:00:07.000000000 +0100
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+++ iptables-1.2.9/libipq/libipq.c	2003-12-05 17:00:39.000000000 +0100
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@@ -171,6 +171,10 @@
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 		ipq_errno = IPQ_ERR_RECV;
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 		return -1;
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 	}
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+	if (h->peer.nl_pid != 0) {
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+		ipq_errno = IPQ_ERR_RECV;
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+		return -1;
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+	}
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 	if (status == 0) {
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 		ipq_errno = IPQ_ERR_NLEOF;
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 		return -1;