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[AMF] Ensure AMF gracefully rejects registrations with no subscription slices (#3970)

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Previously, malformed S-NSSAI parameters could trigger a fatal assertion in
amf_update_allowed_nssai when the UE had zero slices in its subscription
database. This patch introduces an explicit check for amf_ue->num_of_slice == 0,
logs a clear error message including the UE’s SUPI, and returns false to
reject the registration.

The removed assertion prevents AMF crashes and ensures
that other UEs continue to be served normally.
This commit is contained in:
Sukchan Lee
2025-07-09 21:41:52 +09:00
parent 345800ba94
commit ae5fda2620
1 changed files with 6 additions and 1 deletions
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7
src/amf/context.c
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@@ -2974,6 +2974,12 @@ bool amf_update_allowed_nssai(amf_ue_t *amf_ue)
amf_ue->rejected_nssai.num_of_s_nssai = 0;
if (amf_ue->requested_nssai.num_of_s_nssai) {
if (amf_ue->num_of_slice == 0) {
ogs_error("[%s] No Slice in Subscription DB", amf_ue->supi);
return false;
}
for (i = 0; i < amf_ue->requested_nssai.num_of_s_nssai; i++) {
ogs_slice_data_t *slice = NULL;
ogs_nas_s_nssai_ie_t *requested =
@@ -2986,7 +2992,6 @@ bool amf_update_allowed_nssai(amf_ue_t *amf_ue)
s_nssai[amf_ue->rejected_nssai.num_of_s_nssai];
bool ta_supported = false;
ogs_assert(amf_ue->num_of_slice);
slice = ogs_slice_find_by_s_nssai(
amf_ue->slice, amf_ue->num_of_slice,
(ogs_s_nssai_t *)requested);