bsc: Avoid crashing when no lchan is present in the subscriber connection
If someone wants to send a message but we have no lchan anymore
we will now complain, delete the message and return.
diff --git a/openbsc/src/bsc_api.c b/openbsc/src/bsc_api.c
index 267998f..35babc3 100644
--- a/openbsc/src/bsc_api.c
+++ b/openbsc/src/bsc_api.c
@@ -262,7 +262,17 @@
int gsm0808_submit_dtap(struct gsm_subscriber_connection *conn,
struct msgb *msg, int link_id, int allow_sach)
{
- uint8_t sapi = link_id & 0x7;
+ uint8_t sapi;
+
+
+ if (!conn->lchan) {
+ LOGP(DMSC, LOGL_ERROR,
+ "Called submit dtap without an lchan.\n");
+ msgb_free(msg);
+ return -1;
+ }
+
+ sapi = link_id & 0x7;
msg->lchan = conn->lchan;
msg->trx = msg->lchan->ts->trx;