tcp: Make TCP_MAXSEG minimum more correct.

[ Upstream commit c39508d6f118308355468314ff414644115a07f3 ]

Use TCP_MIN_MSS instead of constant 64.

Reported-by: Min Zhang <mzhang@mvista.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 0e185e802d7dc813bc272a0c694032b074308f7d..6adb1abf05e0f67ed928dd3233b8bbb099e075aa 100644 (file)
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -2246,7 +2246,7 @@ static int do_tcp_setsockopt(struct sock *sk, int level,
                /* 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 < 64 || val > MAX_TCP_WINDOW) {
+               if (val < TCP_MIN_MSS || val > MAX_TCP_WINDOW) {
                        err = -EINVAL;
                        break;
                }