[Bugs] AMF crashed when receving invalid NGAP messages about free5gc HOT 1 CLOSED

Hi @Jiangwlee,

Thank you for reporting the problem.
According to the implementation of the latest AMF (commit: aebc9fc), it does have error handling for invalid NGAP messages.

I used the test script you provided with slight modifications to get the result, you can check the screenshot:

Here is the modified script:

import sys, sctp, socket

if len(sys.argv) != 2:
  print("Usage: free5gc.py server-address")
  exit(0)

sk = sctp.sctpsocket_tcp(socket.AF_INET)
sk.connect((sys.argv[1], 38412))

sk.sctp_send(b"Hello!", ppid=socket.htonl(60))

input("Press ENTER to leave")

sk.close()

As for the crash result is because you closed the SCTP connection too quickly.

from free5gc.