--- a/brctl/brctl_cmd.c	2019-05-08 16:09:02.744000000 +0800
+++ b/brctl/brctl_cmd.c	2019-05-08 17:40:07.252000000 +0800
@@ -407,6 +407,7 @@
 		if (n < 0) {
 			fprintf(stderr, "read of forward table failed: %s\n",
 				strerror(errno));
+			free(fdb);
 			return 1;
 		}
 
@@ -426,6 +427,7 @@
 		br_show_timer(&f->ageing_timer_value);
 		printf("\n");
 	}
+	free(fdb);
 	return 0;
 }