From 1fbbf0e8371f4fae339b007b086ed1be176e7b83 Mon Sep 17 00:00:00 2001
From: sg <goldsimon@gmx.de>
Date: Fri, 4 Sep 2015 21:12:39 +0200
Subject: [PATCH] lwip_getaddrinfo: check max name length

---
 src/api/netdb.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/api/netdb.c b/src/api/netdb.c
index 1ba7113e..c25e71b9 100644
--- a/src/api/netdb.c
+++ b/src/api/netdb.c
@@ -349,6 +349,10 @@ lwip_getaddrinfo(const char *nodename, const char *servname,
   total_size = sizeof(struct addrinfo) + sizeof(struct sockaddr_in);
   if (nodename != NULL) {
     namelen = strlen(nodename);
+    if (namelen > DNS_MAX_NAME_LENGTH) {
+      /* invalid name length */
+      return EAI_FAIL;
+    }
     LWIP_ASSERT("namelen is too long", (namelen + 1) <= (mem_size_t)-1);
     total_size += namelen + 1;
   }