[GPRS] NS: Fix segfault when receiving message from unknown NS-VC
In the previous code we used a static fake_nsvc structure in
case we needed to send a message to an unknown NSVC for which
we don't have a real 'struct nsvc'. However, since we now have
a rate_ctr_group hanging off the nsvc, the fake structure didn't
have that.
So now we keep a nsi->unknown_nsvc around to be used whenever
we need a nsvc but don't have a real one. The gprs_ns_vty.c
code explicitly does not list that NSVC in 'show ns'
diff --git a/openbsc/src/gprs/gprs_ns_vty.c b/openbsc/src/gprs/gprs_ns_vty.c
index 08b0076..8f0628a 100644
--- a/openbsc/src/gprs/gprs_ns_vty.c
+++ b/openbsc/src/gprs/gprs_ns_vty.c
@@ -109,6 +109,8 @@
struct gprs_nsvc *nsvc;
llist_for_each_entry(nsvc, &nsi->gprs_nsvcs, list) {
+ if (nsvc == nsi->unknown_nsvc)
+ continue;
vty_out(vty, "NSEI %5u, NS-VC %5u, Remote: %-4s, %5s %9s",
nsvc->nsei, nsvc->nsvci,
nsvc->remote_end_is_sgsn ? "SGSN" : "BSS",