fix nullpointer: in gsm48_rx_gmm_ra_upd_req()
This caused frequent crashes at 36c3. The "proper" fix is probably elsewhere
(lynxis mentions an unfinished patch), but at least this prevented some crashes
during active operation.
Once this is merged, we can (re)enable SGSN_Tests_Iu.TC_geran_attach_iu_rau,
which tests exactly for this scenario: A Subscriber / MM context that is so
far attached via GERAN, but now receives a RAU via UTRAN/Iu.
Closes: OS#4339
Change-Id: Ifde15dc4151d84748f0e67b32c9c260cb2d9d8fc
diff --git a/src/sgsn/gprs_gmm.c b/src/sgsn/gprs_gmm.c
index 03ff513..0391229 100644
--- a/src/sgsn/gprs_gmm.c
+++ b/src/sgsn/gprs_gmm.c
@@ -1682,7 +1682,7 @@
rate_ctr_inc(&mmctx->ctrg->ctr[GMM_CTR_PKTS_SIG_IN]);
/* Update the MM context with the new RA-ID */
- if (mmctx->ran_type == MM_CTX_T_GERAN_Gb) {
+ if (mmctx->ran_type == MM_CTX_T_GERAN_Gb && msgb_bcid(msg)) {
bssgp_parse_cell_id(&mmctx->ra, msgb_bcid(msg));
/* Update the MM context with the new (i.e. foreign) TLLI */
mmctx->gb.tlli = msgb_tlli(msg);