Xn Handover - AMF crash fix #306
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thakurajayL
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Sep 23, 2024
| // Check if the smContext is nil to prevent nil pointer dereference | ||
| if smContext == nil { | ||
| return nil, nil, nil, fmt.Errorf("smContext is nil") | ||
| } |
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What was the outcome of the Xn handover after this fix?
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Before this fix, if the PDU session ID was invalid, the AMF would crash. However, after this fix, the AMF properly sends a Path Switch Request Failure to the gNodeB. You can verify this by checking the AMF logs and PCAPs.
Signed-off-by: Jayaram R <[email protected]>
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Issue:
Xn Handover failure due to AMF crashing when the gNodeB provides an incorrect PDU Session ID in the NG Path Switch Request.
Troubleshoot:
The crash was traced to the absence of a proper check for the PDU Session ID in the SendUpdateSmContextXnHandover function, causing the AMF to crash when receiving an incorrect or invalid PDU Session ID from the gNodeB.
Fix:
The issue has been resolved by adding a nil check in the SendUpdateSmContextXnHandover function.
Supporting Data:
Xn-Handover-AMF-Crash-PCAP-Logs.zip