append after strlen, not sizeof

src/host_config.c

@@ -119,7 +119,7 @@ struct uci_section *config_add_section(struct uci_context *ctx,
 
 	/* walk through other tokens */
 	while (token != NULL) {
-		snprintf(name_section + sizeof(name_section),
+		snprintf(name_section + strlen(name_section),
 			sizeof(name_section), "%s%s", name_section, token);
 		token = strtok(NULL, s);
 	}