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Fixed bug #29080: Correctly handle remote side overrunning our rcv_wnd in ooseq case.

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goldsimon
2010-03-25 06:39:01 +00:00
parent d861daeb4e
commit cf0b831971
3 changed files with 136 additions and 1 deletions
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18
src/core/tcp_in.c
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@@ -1402,6 +1402,24 @@ tcp_receive(struct tcp_pcb *pcb)
next->len = (u16_t)(seqno - next->tcphdr->seqno);
pbuf_realloc(next->p, next->len);
}
/* check if the remote side overruns our receive window */
if ((u32_t)tcplen + seqno > pcb->rcv_nxt + (u32_t)pcb->rcv_wnd) {
LWIP_DEBUGF(TCP_INPUT_DEBUG,
("tcp_receive: other end overran receive window"
"seqno %"U32_F" len %"U16_F" right edge %"U32_F"\n",
seqno, tcplen, pcb->rcv_nxt + pcb->rcv_wnd));
if (TCPH_FLAGS(next->next->tcphdr) & TCP_FIN) {
/* Must remove the FIN from the header as we're trimming
* that byte of sequence-space from the packet */
TCPH_FLAGS_SET(next->next->tcphdr, TCPH_FLAGS(next->next->tcphdr) &~ TCP_FIN);
}
/* Adjust length of segment to fit in the window. */
next->next->len = pcb->rcv_nxt + pcb->rcv_wnd - seqno;
pbuf_realloc(next->next->p, next->next->len);
tcplen = TCP_TCPLEN(next->next);
LWIP_ASSERT("tcp_receive: segment not trimmed correctly to rcv_wnd\n",
(seqno + tcplen) == (pcb->rcv_nxt + pcb->rcv_wnd));
}
}
break;
}