wenquan2015 opened a new pull request, #17715:
URL: https://github.com/apache/nuttx/pull/17715
## Summary
in multi-core cpu, tcp_free and tcp_timer_expiry->tcp_timer will work in
parallel, after tcp_free call work_cancle, tcp->timer will call
tcp_update_timer to re-add work to worker queue, then tcp_free free conn, in
this condition, it will result use after free.
## Impact
tcp
## Testing
Check the normal TCP process ok
```
NuttShell (NSH) NuttX-12.12.0-RC0
MOTD: username=admin password=Administrator
nsh> iperf -c 10.0.1.1 -i 1 -t 3
IP: 10.0.1.2
mode=tcp-client sip=10.0.1.2:5001,dip=10.0.1.1:5001, interval=1, time=3
Interval Transfer Bandwidth
0.00- 6.28 sec 359628800 Bytes 458.13 Mbits/sec
0.00- 6.28 sec 4307517440 Bytes 5487.28 Mbits/sec
iperf exit
nsh>
```
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