From 4befed8d454a77d63fea48725d007dc41ba05a61 Mon Sep 17 00:00:00 2001
From: XANTRONIX Development <dev@xantronix.com>
Date: Fri, 14 Aug 2020 17:38:16 -0400
Subject: [PATCH] Check for nil buffers in patty_ax25_sock_destroy()

Check before trying to free() nil buffers in patty_ax25_sock_destroy()
---
 src/sock.c | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/src/sock.c b/src/sock.c
index 1c87d60..cf77235 100644
--- a/src/sock.c
+++ b/src/sock.c
@@ -198,9 +198,18 @@ void patty_ax25_sock_destroy(patty_ax25_sock *sock) {
         (void)close(sock->fd);
     }
 
-    free(sock->tx_slots);
-    free(sock->rx_buf);
-    free(sock->tx_buf);
+    if (sock->tx_slots) {
+        free(sock->tx_slots);
+    }
+
+    if (sock->rx_buf) {
+        free(sock->rx_buf);
+    }
+
+    if (sock->tx_buf) {
+        free(sock->tx_buf);
+    }
+
     free(sock);
 }