[lwip-devel] [bug #38219] Assert on TCP netconn_write with sndtimeout set

[Matthias Blaicher]

Follow-up Comment #3, bug #38219 (project lwip):

I also just ran into this issue. The assert triggers, because
msg->conn->current_msg is 0, but msg->conn->write_offset is not. 

I tried adding conn->write_offset = 0; in the partial write branch if
do_write_more:

#if LWIP_SO_SNDTIMEO
  if ((conn->send_timeout != 0) &&
      ((s32_t)(sys_now() - conn->current_msg->msg.w.time_started) >=
conn->send_timeout)) {
    write_finished = 1;
    if (conn->write_offset == 0) {
      /* nothing has been written */
      err = ERR_WOULDBLOCK;
      conn->current_msg->msg.w.len = 0;
    } else {
      /* partial write */
      err = ERR_OK;
      conn->current_msg->msg.w.len = conn->write_offset;
      conn->write_offset = 0; /* <= ADDED THIS */
    }
  } else
#endif /* LWIP_SO_SNDTIMEO */

Which seems to fix my problems.

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