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Index: head/sys/netinet/tcp_input.c
===================================================================
--- head/sys/netinet/tcp_input.c
+++ head/sys/netinet/tcp_input.c
@@ -2226,7 +2226,7 @@
/*
* DSACK - add SACK block for dropped range
*/
- if (tp->t_flags & TF_SACK_PERMIT) {
+ if ((todrop > 0) && (tp->t_flags & TF_SACK_PERMIT)) {
tcp_update_sack_list(tp, th->th_seq,
th->th_seq + todrop);
/*
Index: head/sys/netinet/tcp_stacks/rack_bbr_common.c
===================================================================
--- head/sys/netinet/tcp_stacks/rack_bbr_common.c
+++ head/sys/netinet/tcp_stacks/rack_bbr_common.c
@@ -548,7 +548,7 @@
/*
* DSACK - add SACK block for dropped range
*/
- if (tp->t_flags & TF_SACK_PERMIT) {
+ if ((todrop > 0) && (tp->t_flags & TF_SACK_PERMIT)) {
tcp_update_sack_list(tp, th->th_seq,
th->th_seq + todrop);
/*

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