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mme: fix Served TAI lookup for TAC range configuration

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mme_find_served_tai() incorrectly compares the PLMN-ID of TAC range
entries using list0->tai[j].plmn_id instead of list1->tai[j].plmn_id.

When TAC ranges are configured in mme.tai (e.g. tac: [1-11]), the range
entries are stored in list1. However, the lookup logic mistakenly reads
the PLMN from list0 while validating list1 entries, which can cause the
Served TAI match to fail even though the TAC is within the configured
range.

As a result, eNB S1 Setup may fail with:

  Cannot find Served TAI. Check 'mme.tai' configuration

This patch fixes the comparison to use list1->tai[j].plmn_id so that TAC
range entries are matched correctly.

Fixes TAC range configuration such as:

  tac: [1-11]

Issues: #4345
This commit is contained in:
Sukchan Lee 2026-03-11 08:36:54 +09:00
parent 80eb484a6a
commit 9242c28cf5
1 changed files with 1 additions and 1 deletions
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2
src/mme/mme-context.c
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@ -5006,7 +5006,7 @@ int mme_find_served_tai(ogs_eps_tai_t *tai)
ogs_assert(list1->tai[j].type == OGS_TAI1_TYPE);
ogs_assert(list1->tai[j].num <= OGS_MAX_NUM_OF_TAI);
if (memcmp(&list0->tai[j].plmn_id,
if (memcmp(&list1->tai[j].plmn_id,
&tai->plmn_id, OGS_PLMN_ID_LEN) == 0 &&
list1->tai[j].tac <= tai->tac &&
tai->tac < (list1->tai[j].tac+list1->tai[j].num))