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net/tcp/tcp_send_buffered.c: Fix assertion crash when window size is zero.

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This commit is contained in:
Gregory Nutt 2019-02-14 08:39:16 -06:00
parent 350295d009
commit 359753adee
1 changed files with 7 additions and 5 deletions
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12
net/tcp/tcp_send_buffered.c
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@ -759,13 +759,14 @@ static uint16_t psock_send_eventhandler(FAR struct net_driver_s *dev,
* asked to retransmit data, (3) the connection is still healthy, and (4)
* the outgoing packet is available for our use. In this case, we are
* now free to send more data to receiver -- UNLESS the buffer contains
* unprocessed incoming data. In that event, we will have to wait for the
* next polling cycle.
* unprocessed incoming data or window size is zero. In that event, we
* will have to wait for the next polling cycle.
*/
if ((conn->tcpstateflags & TCP_ESTABLISHED) &&
(flags & (TCP_POLL | TCP_REXMIT)) &&
!(sq_empty(&conn->write_q)))
!(sq_empty(&conn->write_q)) &&
conn->winsize > 0)
{
/* Check if the destination IP address is in the ARP or Neighbor
* table. If not, then the send won't actually make it out... it
@ -803,8 +804,9 @@ static uint16_t psock_send_eventhandler(FAR struct net_driver_s *dev,
sndlen = conn->winsize;
}
ninfo("SEND: wrb=%p pktlen=%u sent=%u sndlen=%u\n",
wrb, TCP_WBPKTLEN(wrb), TCP_WBSENT(wrb), sndlen);
ninfo("SEND: wrb=%p pktlen=%u sent=%u sndlen=%u mss=%u winsize=%u\n",
wrb, TCP_WBPKTLEN(wrb), TCP_WBSENT(wrb), sndlen, conn->mss,
conn->winsize);
/* Set the sequence number for this segment. If we are
* retransmitting, then the sequence number will already