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During integration tests with a third-party SCP, SMF crashed after processing the UDM response to a PUT request during UE attachment. This issue was traced to a missing NULL-check on the `stream` pointer inside smf_state_operational(). Previously, the code asserted `stream` unconditionally when sending the HTTP response or PDU session created data. If the SBI stream had already been removed, the assertion failed, causing SMF to abort. This patch adds a NULL-check for `stream`. When `stream` is NULL, an error log is printed instead of asserting. This prevents SMF from crashing and allows it to continue processing. Tested with: - Open5GS v2.7.6-21-g0516e01 - SCP from another vendor (crash reproduced and fixed) - Open5GS SCP (no crash observed) Fixes: smf_state_operational() assertion failure at smf-sm.c:1075
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