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fix (NAS UE): account for Service Request encoder length

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Fix remaining length tracking in Service Request encoding so IE
encoding uses the proper buffer budget per step.

Changes:
- decrement `len` by fixed per-field sizes instead of cumulative `encoded`

Refs:
- TS 24.501 8.2.16 (Service request)

Signed-off-by: Guido Casati <guido.casati@openairinterface.org>
This commit is contained in:
Guido Casati
2026-04-15 17:46:01 +02:00
parent 220ef3cdeb
commit 12c6d8d3e4
1 changed files with 2 additions and 2 deletions
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4
openair3/NAS/NR_UE/5GS/5GMM/MSG/fgs_service_request.c
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@@ -33,11 +33,11 @@ int encode_fgs_service_request(uint8_t *buffer, const fgs_service_request_msg_t
*buffer = ((encode_nas_key_set_identifier(&service_request->naskeysetidentifier, IEI_NULL) & 0x0f) << 4) *buffer = ((encode_nas_key_set_identifier(&service_request->naskeysetidentifier, IEI_NULL) & 0x0f) << 4)
| (service_request->serviceType & 0x0f); | (service_request->serviceType & 0x0f);
encoded++; encoded++;
len -= encoded; len -= 1;
// 5GS Mobile Identity (M) type 5G-S-TMSI (9 octets) // 5GS Mobile Identity (M) type 5G-S-TMSI (9 octets)
encoded += LEN_FGS_MOBILE_ID_CONTENTS_SIZE; // skip "Length of 5GS mobile identity contents" IE encoded += LEN_FGS_MOBILE_ID_CONTENTS_SIZE; // skip "Length of 5GS mobile identity contents" IE
len -= encoded; len -= LEN_FGS_MOBILE_ID_CONTENTS_SIZE;
encoded += encode_stmsi_5gs_mobile_identity(buffer + encoded, &service_request->fiveg_s_tmsi, len); encoded += encode_stmsi_5gs_mobile_identity(buffer + encoded, &service_request->fiveg_s_tmsi, len);
// encode length of 5GS mobile identity contents // encode length of 5GS mobile identity contents
uint16_t tmp = htons(encoded - LEN_FGS_MOBILE_ID_CONTENTS_SIZE - 1); uint16_t tmp = htons(encoded - LEN_FGS_MOBILE_ID_CONTENTS_SIZE - 1);