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J. Nick Koston
49024c240b
Between accept_fn_ storing a raw PCB and accept() picking it up, the connection could error (RST, timeout). Without an error callback, lwip frees the PCB silently, leaving a dangling pointer. When accept() later creates LWIPRawImpl with it, the use-after-free corrupts the heap. Fix: register a lightweight error callback (no allocation) in accept_fn_ that nulls the array slot when the PCB is freed. accept() checks for null and skips freed PCBs. After shifting the array, tcp_arg pointers are updated for remaining entries.
