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iu_client: Prevent crash if msgb passed to ranap_iu_tx has no dst

Related: OS#5398
Change-Id: I64beecd2c492d6312f60a1cf016ef022cda5252d
---
M src/iu_client.c
1 file changed, 6 insertions(+), 0 deletions(-)

diff --git a/src/iu_client.c b/src/iu_client.c
index da433da..7d29903 100644
--- a/src/iu_client.c
+++ b/src/iu_client.c
@@ -461,6 +461,12 @@
 	struct msgb *msg;
 	struct osmo_scu_prim *prim;
 
+	if (!uectx) {
+		LOGPIU(LOGL_ERROR, "Discarding to-be-transmitted L3 Message as RANAP DT with unset dst SCCP conn_id!\n",
+		       uectx->conn_id);
+		return -ENOTCONN;
+	}
+
 	LOGPIU(LOGL_INFO, "Transmitting L3 Message as RANAP DT (SCCP conn_id %u)\n",
 	       uectx->conn_id);
 

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