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tcp_in : fix ooseq update error

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if a pbuf received with the same seqno in ooseq ,
we then check  the size and replace the existing one
with the larger one,but if the existing one is the
last segment in ooseq ,it might has been trimed before.
the replacing action will overrun our receive windows

see patch #10106 and bug #56397
This commit is contained in:
duckpowerMB 2021-09-09 16:52:55 +08:00 committed by Simon Goldschmidt
parent de0b97861a
commit 574bd6e5aa
1 changed files with 9 additions and 0 deletions
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9
src/core/tcp_in.c
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@ -1687,6 +1687,15 @@ tcp_receive(struct tcp_pcb *pcb)
->ooseq. We check the lengths to see which one to ->ooseq. We check the lengths to see which one to
discard. */ discard. */
if (inseg.len > next->len) { if (inseg.len > next->len) {
/* If next segment is the last segment in ooseq
and smaller than inseg, that means it has been
trimmed before to fit our window, so we just
break here. */
if (next->next == NULL) {
break;
}
/* The incoming segment is larger than the old /* The incoming segment is larger than the old
segment. We replace some segments with the new segment. We replace some segments with the new
one. */ one. */