From 1fa65c593c6d2fbafe9d0f7caa6eb1c8034da2e0 Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Wed, 16 Jul 2014 03:29:20 +0200
Subject: [PATCH] dns-domain: never allow labels that are larger than 63 chars

---
 src/resolve/resolved-dns-domain.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/resolve/resolved-dns-domain.c b/src/resolve/resolved-dns-domain.c
index 33ae2610e..27739c1e5 100644
--- a/src/resolve/resolved-dns-domain.c
+++ b/src/resolve/resolved-dns-domain.c
@@ -45,6 +45,9 @@ int dns_label_unescape(const char **name, char *dest, size_t sz) {
                 if (sz <= 0)
                         return -ENOSPC;
 
+                if (r >= DNS_LABEL_MAX)
+                        return -EINVAL;
+
                 if (*n == '\\') {
                         /* Escaped character */
 
@@ -114,6 +117,9 @@ int dns_label_escape(const char *p, size_t l, char **ret) {
         assert(p);
         assert(ret);
 
+        if (l > DNS_LABEL_MAX)
+                return -EINVAL;
+
         s = malloc(l * 4 + 1);
         if (!s)
                 return -ENOMEM;
-- 
2.30.2