From fe723808887245458f9cf494193138e63f31c000 Mon Sep 17 00:00:00 2001
From: XANTRONIX Development <dev@xantronix.com>
Date: Fri, 24 Jul 2020 19:36:55 -0400
Subject: [PATCH] Add validation to patty_ax25_sock_send()

Changes:

    * Make patty_ax25_sock_send() set ENETDOWN when no network interface
      is associated with a sock

    * Make patty_ax25_sock_send() set EBADF when no remote address is
      associated with a sock
---
 src/sock.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/src/sock.c b/src/sock.c
index e5156b5..a60c406 100644
--- a/src/sock.c
+++ b/src/sock.c
@@ -363,6 +363,18 @@ ssize_t patty_ax25_sock_send(patty_ax25_sock *sock,
     uint8_t *buf = PATTY_AX25_FRAME_CONTROL_U(control)?
         sock->tx_buf: tx_slot(sock, sock->seq_send);
 
+    if (sock->iface == NULL) {
+        errno = ENETDOWN;
+
+        goto error_noif;
+    }
+
+    if (sock->remote.callsign[0] == '\0') {
+        errno = EBADF;
+
+        goto error_nopeer;
+    }
+
     if (toobig(sock, infolen)) {
         goto error_toobig;
     }
@@ -393,6 +405,8 @@ ssize_t patty_ax25_sock_send(patty_ax25_sock *sock,
 
 error_encode_address:
 error_toobig:
+error_nopeer:
+error_noif:
     return -1;
 }