anchao opened a new pull request, #20859:
URL: https://github.com/apache/nuttx/pull/20859
## Summary
Fix the packet socket buffered send error path by allocating the send
callback before enqueueing the prepared IOB.
`pkt_sendmsg()` previously queued the IOB into `conn->write_q` before
allocating the send callback. If callback allocation failed after that,
the error path still jumped to `errout_with_iob` and freed the IOB even
though ownership had already moved to the connection write queue.
This change allocates and validates the callback before enqueueing the
IOB. The IOB remains locally owned until all resources needed to notify
the driver are available.
## Impact
- Avoids freeing an IOB after it has already been queued.
- Prevents corrupting the packet socket write queue on callback
allocation failure.
- Keeps the successful send path behavior unchanged.
- Affects buffered packet socket send only.
## Testing
sim/matter
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