From 9f70ccd6764dfb262e2caf9d30d3415c4f074982 Mon Sep 17 00:00:00 2001
From: Darell Tan <darell.tan@gmail.com>
Date: Mon, 13 Nov 2017 23:57:18 +0800
Subject: [PATCH] Ensure NULL terminator is not written past end of allocated
 buffer.

---
 mdns.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/mdns.c b/mdns.c
index 4781f1d..abe8182 100644
--- a/mdns.c
+++ b/mdns.c
@@ -112,6 +112,10 @@ char *nlabel_to_str(const uint8_t *name) {
 		p += label_len;
 	}
 
+	// avoid writing NULL past end of buffer
+	if (buf_len == 0)
+		labelp--;
+
 	*labelp = '\0';
 
 	return label;