From 7b54e32c63341ef6d12ec80e295c57f2c447fb48 Mon Sep 17 00:00:00 2001
From: Harald Welte <laforge@gnumonks.org>
Date: Mon, 7 Sep 2015 22:41:45 +0200
Subject: [PATCH] hnbap: Don't enqueue a NULL msgb for transmit

---
 src/hnbgw_hnbap.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/hnbgw_hnbap.c b/src/hnbgw_hnbap.c
index 65e5cc96..cdd4895d 100644
--- a/src/hnbgw_hnbap.c
+++ b/src/hnbgw_hnbap.c
@@ -16,6 +16,9 @@
 
 static int hnbgw_hnbap_tx(struct hnb_context *ctx, struct msgb *msg)
 {
+	if (!msg)
+		return -EINVAL;
+
 	msgb_ppid(msg) = IUH_PPI_HNBAP;
 	return osmo_wqueue_enqueue(&ctx->wqueue, msg);
 }