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osmux: Fix null ptr dereference sending UL data before the remote is configured

Related: SYS#6161
Change-Id: I5d7971c0ed9b22d35d8965af54031a43c6388762
---
M src/common/osmux.c
1 file changed, 4 insertions(+), 0 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/osmo-bts refs/changes/08/29908/1

diff --git a/src/common/osmux.c b/src/common/osmux.c
index 3f137e5..acf3a1d 100644
--- a/src/common/osmux.c
+++ b/src/common/osmux.c
@@ -493,6 +493,10 @@
 	rtph = (struct rtp_hdr *)msgb_data(msg);
 	rtph->marker = marker;
 
+	/* Avoid using the osmux.in if not yet connected. */
+	if (!lchan_osmux_connected(lchan))
+		return -1;
+
 	while ((rc = osmux_xfrm_input(lchan->abis_ip.osmux.in, msg,
 				      lchan->abis_ip.osmux.remote_cid)) > 0) {
 		/* batch full, build and deliver it */

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