invalid memory address error in GetPDUAddressInformation

[gruyaume]

Description

I was working on a change in the SMF and encountered an issue when running end to end tests with gnbsim. While in normal scenarios we should not encounter this issue, it is expected that gnbsim errors out cleanly and does not panic.

Environment

• gnbsim version: 1.4.3

Logs

2024-10-17T22:15:53Z [INFO][GNBSIM][RealUe][imsi-001010100007487] Handling: PDU-SESSION-ESTABLISHMENT-ACCEPT-EVENT
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0xe81e5b]

goroutine 58 [running]:
github.com/omec-project/nas/nasType.(*PDUAddress).GetPDUAddressInformation(...)
	/root/go/pkg/mod/github.com/omec-project/[email protected]/nasType/NAS_PDUAddress.go:62
github.com/omec-project/gnbsim/realue.HandlePduSessEstAcceptEvent(0xc0005aafc0, {0x137d508?, 0xc0003b6370})
	/root/parts/gnbsim/build/realue/handler.go:239 +0x11b
github.com/omec-project/gnbsim/realue.HandleEvents(0xc0005aafc0)
	/root/parts/gnbsim/build/realue/realue.go:47 +0x3af
github.com/omec-project/gnbsim/realue.Init(0xc0005aafc0)
	/root/parts/gnbsim/build/realue/realue.go:16 +0x228
github.com/omec-project/gnbsim/simue.Init.func1()
	/root/parts/gnbsim/build/simue/simue.go:38 +0x53
created by github.com/omec-project/gnbsim/simue.Init in goroutine 1
	/root/parts/gnbsim/build/simue/simue.go:36 +0x148