From d542978219e5229e0ff7dd36423fc4b5b924f356 Mon Sep 17 00:00:00 2001
From: claudio <claudio@openbsd.org>
Date: Wed, 15 Jun 2022 16:00:37 +0000
Subject: [PATCH] Prevent busy poll loop on pfkey message error.

When pfkey_reply() detects an error in a message it needs to flush that
message out of the buffer because pfkey_read() only did a peak read.
OK tb@
---
 usr.sbin/bgpd/pfkey.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/usr.sbin/bgpd/pfkey.c b/usr.sbin/bgpd/pfkey.c
index 6da7de6519c..fafef64b98f 100644
--- a/usr.sbin/bgpd/pfkey.c
+++ b/usr.sbin/bgpd/pfkey.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: pfkey.c,v 1.63 2022/06/15 14:09:30 claudio Exp $ */
+/*	$OpenBSD: pfkey.c,v 1.64 2022/06/15 16:00:37 claudio Exp $ */
 
 /*
  * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
@@ -469,6 +469,9 @@ pfkey_reply(int sd, uint32_t *spi)
 			return (0);
 		else {
 			log_warn("pfkey");
+			/* discard error message */
+			if (read(sd, &hdr, sizeof(hdr)) == -1)
+				log_warn("pfkey read");
 			return (-1);
 		}
 	}
-- 
2.20.1