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-rw-r--r--openbsc/src/gprs/gprs_gmm.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/openbsc/src/gprs/gprs_gmm.c b/openbsc/src/gprs/gprs_gmm.c
index 4dcd4cdb3..d06b2c0d6 100644
--- a/openbsc/src/gprs/gprs_gmm.c
+++ b/openbsc/src/gprs/gprs_gmm.c
@@ -1345,7 +1345,17 @@ static int gsm0408_rcv_gmm(struct sgsn_mm_ctx *mmctx, struct msgb *msg,
case GSM48_MT_GMM_ATTACH_REQ:
rc = gsm48_rx_gmm_att_req(mmctx, msg, llme);
break;
+ default:
+ break;
+ }
+
/* For all the following types mmctx can not be NULL */
+ if (!mmctx) {
+ /* FIXME: return some error? */
+ return -1;
+ }
+
+ switch (gh->msg_type) {
case GSM48_MT_GMM_ID_RESP:
rc = gsm48_rx_gmm_id_resp(mmctx, msg);
break;