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-rw-r--r--sys/netinet/tcp_output.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/sys/netinet/tcp_output.c b/sys/netinet/tcp_output.c
index dc67a5d..0ea53e2 100644
--- a/sys/netinet/tcp_output.c
+++ b/sys/netinet/tcp_output.c
@@ -739,7 +739,7 @@ send:
if (len + optlen + ipoptlen > tp->t_maxopd) {
flags &= ~TH_FIN;
if (tso) {
- if (len > TCP_MAXWIN) {
+ if (len > TCP_MAXWIN - hdrlen) {
len = TCP_MAXWIN - hdrlen;
len = len - (len % (tp->t_maxopd - optlen));
sendalot = 1;
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