--- net/ipv4/tcp.c

+++ net/ipv4/tcp.c

@@ -2117,7 +2117,7 @@ static int do_tcp_setsockopt(struct sock

/* Values greater than interface MTU won't take effect. However

* at the point when this call is done we typically don't yet

* know which interface is going to be used */

- if (val < 8 || val > MAX_TCP_WINDOW) {

+ if (val < TCP_MIN_MSS || val > MAX_TCP_WINDOW) {

err = -EINVAL;

break;

}