[lwip-devel] [bug #59632] Calling tcp_write() without TCP_WRITE_FLAG_COPY does in fact copy data

[Oleg Kobrin]

URL:
  <https://savannah.nongnu.org/bugs/?59632>

                 Summary: Calling tcp_write() without TCP_WRITE_FLAG_COPY does
in fact copy data
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: kiabrin
            Submitted on: Пн 07 дек 2020 17:17:21
                Category: TCP
                Severity: 3 - Normal
              Item Group: Faulty Behaviour
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: None
            lwIP version: git head

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Details:

Hello!

Debugging my code on TivaC MCU, NO_OS configuration, I realized after call to
tcp_write() with no TCP_WRITE_FLAG_COPY flag that pcb->snd_buf was decreased
and real pcb->unsent->p->payload points not to my data, but somewhere inside
lwip memory pool.
This is not good, as at high output traffic I experience tcp send buffer
overflows, causing data loss.





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