From cfc62d878f8d436e6a2a99cef5559a7a98c43b3c Mon Sep 17 00:00:00 2001 From: Gao Feng Date: Tue, 21 Mar 2017 09:28:03 +0800 Subject: [PATCH] net: tcp: Permit user set TCP_MAXSEG to default value When user_mss is zero, it means use the default value. But the current codes don't permit user set TCP_MAXSEG to the default value. It would return the -EINVAL when val is zero. Signed-off-by: Gao Feng Signed-off-by: David S. Miller --- net/ipv4/tcp.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index cf4555581282..eccec53ef100 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -2470,7 +2470,7 @@ 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 < TCP_MIN_MSS || val > MAX_TCP_WINDOW) { + if (val && (val < TCP_MIN_MSS || val > MAX_TCP_WINDOW)) { err = -EINVAL; break; }