[PATCH iproute2] ss: take care of unknown min_rtt

[Eric Dumazet]

From: Eric Dumazet <eduma...@google.com>

Kernel sets info->tcpi_min_rtt to ~0U when no RTT sample was ever
taken for the session, thus min_rtt is unknown.

Signed-off-by: Eric Dumazet <eduma...@google.com>
---
 misc/ss.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/misc/ss.c b/misc/ss.c
index 38cf331..51ff5ac 100644
--- a/misc/ss.c
+++ b/misc/ss.c
@@ -2018,7 +2018,8 @@ static void tcp_show_info(const struct nlmsghdr *nlh, 
struct inet_diag_msg *r,
                s.segs_out = info->tcpi_segs_out;
                s.segs_in = info->tcpi_segs_in;
                s.not_sent = info->tcpi_notsent_bytes;
-               s.min_rtt = (double) info->tcpi_min_rtt / 1000;
+               if (info->tcpi_min_rtt && info->tcpi_min_rtt != ~0U)
+                       s.min_rtt = (double) info->tcpi_min_rtt / 1000;
                tcp_stats_print(&s);
                free(s.dctcp);
        }