From 32a19025bcaa705590c536f801a85e1e57d42942 Mon Sep 17 00:00:00 2001
From: gaoxingwang <gxw94linux@163.com>
Date: Wed, 26 Oct 2022 15:23:30 +0800
Subject: [PATCH] lldptool: fix null pointer deference

---
 weak_readline.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/weak_readline.c b/weak_readline.c
index 6b14f07..2d8da46 100644
--- a/weak_readline.c
+++ b/weak_readline.c
@@ -80,10 +80,14 @@ void using_history(void)
 void close_history(void)
 {
 	if (inited) {
-		dlclose(rl_handle);
-		rl_handle = NULL;
-		dlclose(hist_handle);
-		hist_handle = NULL;
+                if (rl_handle) {
+                        dlclose(rl_handle);
+                        rl_handle = NULL;
+                }
+                if (hist_handle) {
+                        dlclose(hist_handle);
+                        hist_handle = NULL;
+                }
 	}
 }