1 files changed, 3 insertions, 0 deletions

diff --git a/net/ipv4/tcp_vegas.c b/net/ipv4/tcp_vegas.c
index 73e19cf7df21..e218a51ceced 100644
--- a/net/ipv4/tcp_vegas.c
+++ b/net/ipv4/tcp_vegas.c
@@ -117,6 +117,9 @@ void tcp_vegas_pkts_acked(struct sock *sk, u32 cnt, ktime_t last)
         struct vegas *vegas = inet_csk_ca(sk);
         u32 vrtt;
 
+        if (ktime_equal(last, net_invalid_timestamp()))
+                return;
+
         /* Never allow zero rtt or baseRTT */
         vrtt = ktime_to_us(net_timedelta(last)) + 1;