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-rw-r--r--src/resolve/resolved-dns-packet.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/src/resolve/resolved-dns-packet.c b/src/resolve/resolved-dns-packet.c
index 5f79701296..b0c70d0017 100644
--- a/src/resolve/resolved-dns-packet.c
+++ b/src/resolve/resolved-dns-packet.c
@@ -1580,6 +1580,11 @@ int dns_packet_read_rr(DnsPacket *p, DnsResourceRecord **ret, bool *ret_cache_fl
if (r < 0)
goto fail;
+ /* RFC 2181, Section 8, suggests to
+ * treat a TTL with the MSB set as a zero TTL. */
+ if (rr->ttl & UINT32_C(0x80000000))
+ rr->ttl = 0;
+
r = dns_packet_read_uint16(p, &rdlength, NULL);
if (r < 0)
goto fail;