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mme: preserve subscription data when migrating UE sessions

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Retained PDN sessions reference subscription entries owned by the old
MME UE context. Removing that context frees APN data still in use.

Transfer subscription ownership to the new UE context and rebind
retained PDN references before removing the old context.
This commit is contained in:
Sukchan Lee 2026-10-09 14:36:32 +09:00
parent 064c88f1b4
commit d86e013f23
1 changed files with 18 additions and 0 deletions
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18
src/mme/mme-context.c
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@ -4398,6 +4398,7 @@ int mme_ue_set_imsi(mme_ue_t *mme_ue, char *imsi_bcd,
uint16_t target_bitmap_before = 0;
bool target_had_imsi = false;
char target_imsi_bcd[OGS_MAX_IMSI_BCD_LEN+1];
int i;
ogs_assert(mme_ue && imsi_bcd);
/*
@ -4553,6 +4554,23 @@ int mme_ue_set_imsi(mme_ue_t *mme_ue, char *imsi_bcd,
/* Phase-2 : Move Session Context from OLD to NEW MME-UE Context */
ogs_assert(ogs_list_empty(&mme_ue->sess_list));
/* The retained PDNs still reference the old UE's subscription
* entries. Transfer their ownership and rebind those references
* before removing the old UE, including when the target has a
* previous subscription but no PDNs of its own. */
ogs_assert(old_mme_ue->num_of_session <= OGS_MAX_NUM_OF_SESS);
mme_session_remove_all(mme_ue);
mme_ue->num_of_session = old_mme_ue->num_of_session;
mme_ue->context_identifier = old_mme_ue->context_identifier;
for (i = 0; i < mme_ue->num_of_session; i++) {
mme_ue->session[i] = old_mme_ue->session[i];
ogs_list_for_each(&old_mme_ue->sess_list, old_sess) {
if (old_sess->session == &old_mme_ue->session[i])
old_sess->session = &mme_ue->session[i];
}
}
old_mme_ue->num_of_session = 0;
memcpy(&mme_ue->sess_list,
&old_mme_ue->sess_list, sizeof(mme_ue->sess_list));