Use memmove to prevent memory overlapping

Change-Id: I1d7b95a72327b8d86a8b353b4dab0879ed59ee1d
Signed-off-by: Cheoleun Moon <chleun.moon@samsung.com>

diff --git a/plugins/libwebsockets/libwebsockets-plugin.cpp b/plugins/libwebsockets/libwebsockets-plugin.cpp
index 3c10534..9ae9149 100755 (executable)
--- a/plugins/libwebsockets/libwebsockets-plugin.cpp
+++ b/plugins/libwebsockets/libwebsockets-plugin.cpp
@@ -160,7 +160,10 @@ static void _get_peer_network_info(struct lws *wsi,
                inet_ntop(AF_INET6, &s->sin6_addr, ip, INET6_ADDRSTRLEN);
                if (__is_ipv4_mapped(ip)) {
                        int ip_len = strlen(ip) - IPV4_MAPPED_IPv6_PREFIX_LEN;
-                       strncpy(ip, ip + IPV4_MAPPED_IPv6_PREFIX_LEN, ip_len);
+                       if (ip_len < 0)
+                               ip_len = 0;
+                       else
+                               memmove(ip, ip + IPV4_MAPPED_IPv6_PREFIX_LEN, ip_len);
                        ip[ip_len] = 0;
                        *family = VINE_DP_IPV4;
                }