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bug #27315: zero window probe and FIN: only send pure FIN if the enqueued FIN segment doesn't contain any other data
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@ -948,7 +948,7 @@ tcp_zero_window_probe(struct tcp_pcb *pcb)
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if(seg == NULL)
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return;
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is_fin = (TCPH_FLAGS(seg->tcphdr) & TCP_FIN) != 0;
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is_fin = ((TCPH_FLAGS(seg->tcphdr) & TCP_FIN) != 0) && (seg->len == 0);
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len = is_fin ? TCP_HLEN : TCP_HLEN + 1;
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p = pbuf_alloc(PBUF_IP, len, PBUF_RAM);
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