From 95dd6257a6befedb5b811f16d2cc4a0d8f147751 Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Fri, 1 Aug 2014 00:57:19 +0200
Subject: [PATCH] resolved: don't bother caching negative RRs when the SOA TTL
 is 0 anyway

---
 src/resolve/resolved-dns-cache.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/resolve/resolved-dns-cache.c b/src/resolve/resolved-dns-cache.c
index f7091f07b..40fb6c398 100644
--- a/src/resolve/resolved-dns-cache.c
+++ b/src/resolve/resolved-dns-cache.c
@@ -320,6 +320,8 @@ static int dns_cache_put_negative(DnsCache *c, DnsResourceKey *key, int rcode, u
                 return 0;
         if (key->type == DNS_TYPE_ANY)
                 return 0;
+        if (soa_ttl <= 0)
+                return 0;
 
         if (!IN_SET(rcode, DNS_RCODE_SUCCESS, DNS_RCODE_NXDOMAIN))
                 return 0;
-- 
2.30.2