1 files changed, 7 insertions, 1 deletions

diff --git a/include/net/tcp.h b/include/net/tcp.h
index 3f227baee4be..2ab6c9c1c53a 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -1038,7 +1038,13 @@ static inline int tcp_paws_check(const struct tcp_options_received *rx_opt,
                 return 1;
         if (unlikely(get_seconds() >= rx_opt->ts_recent_stamp + TCP_PAWS_24DAYS))
                 return 1;
-
+        /*
+         * Some OSes send SYN and SYNACK messages with tsval=0 tsecr=0,
+         * then following tcp messages have valid values. Ignore 0 value,
+         * or else 'negative' tsval might forbid us to accept their packets.
+         */
+        if (!rx_opt->ts_recent)
+                return 1;
         return 0;
 }