Use strncpy with the standard way in readFromSSDPSocket.

(cherry picked from commit 04e5767ea0)

ChangeLog

@@ -331,6 +331,7 @@ Version 1.6.16
 	* Respect unique_service_name error in ssdp_request_type
 	  so as not to touch non-terminated buffer under Evt.
 	* Treat large argument as error in UpnpAddVirtualDir.
+	* Use strncpy with the standard way in readFromSSDPSocket.
 	* Do not clear buffer before snprintf.
 	* Clarify the last argument of GetDescDocumentAndURL has size LINE_SIZE.
 	* For inet_ntop, use buffer with size INET6_ADDRSTRLEN or INET_ADDRSTRLEN.

upnp/src/ssdp/ssdp_server.c

@@ -753,9 +753,11 @@ void readFromSSDPSocket(SOCKET socket)
 				  &((struct sockaddr_in6 *)&__ss)->sin6_addr,
 				  ntop_buf, sizeof(ntop_buf));
 #endif /* UPNP_ENABLE_IPV6 */
-		else
+		else {
+			memset(ntop_buf, 0, sizeof(ntop_buf));
 			strncpy(ntop_buf, "<Invalid address family>",
-				sizeof(ntop_buf));
+				sizeof(ntop_buf) - 1);
+		}
 		UpnpPrintf(UPNP_INFO, SSDP, __FILE__, __LINE__,
 			   "Start of received response ----------------------------------------------------\n"
 			   "%s\n"