From a53cbbfa91759a2c8ee2d3d2588b1f97882a5ce1 Mon Sep 17 00:00:00 2001
From: Kaspar Schleiser <kaspar@schleiser.de>
Date: Thu, 18 Mar 2021 14:58:35 +0100
Subject: [PATCH] sys/net/sock_util: zero out temporary buffer

Otherwise, the following strncpy() leaves strtol() with a non-terminated
buffer.
---
 sys/net/sock/sock_util.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sys/net/sock/sock_util.c b/sys/net/sock/sock_util.c
index d02f1d53af..8241eb767d 100644
--- a/sys/net/sock/sock_util.c
+++ b/sys/net/sock/sock_util.c
@@ -170,7 +170,7 @@ int _parse_netif(sock_udp_ep_t *ep_out, char *netifstart)
 {
     char *netifend;
     size_t netiflen;
-    char netifbuf[NETIF_STR_LEN + 1];
+    char netifbuf[NETIF_STR_LEN + 1] = {0};
 
     for (netifend = netifstart; *netifend && *netifend != ']';
          netifend++);