1 files changed, 9 insertions, 0 deletions

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 045d930d01a9..8e5522c6833a 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -3181,6 +3181,15 @@ static int tcp_clean_rtx_queue(struct sock *sk, u32 prior_fack,
 
                 if (tcp_is_reno(tp)) {
                         tcp_remove_reno_sacks(sk, pkts_acked);
+
+                        /* If any of the cumulatively ACKed segments was
+                         * retransmitted, non-SACK case cannot confirm that
+                         * progress was due to original transmission due to
+                         * lack of TCPCB_SACKED_ACKED bits even if some of
+                         * the packets may have been never retransmitted.
+                         */
+                        if (flag & FLAG_RETRANS_DATA_ACKED)
+                                flag &= ~FLAG_ORIG_SACK_ACKED;
                 } else {
                         int delta;