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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 <fgao@ikuai8.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Gao Feng 2017-03-21 09:28:03 +08:00 committed by David S. Miller
parent b2a1674aa1
commit cfc62d878f
1 changed files with 1 additions and 1 deletions
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2
net/ipv4/tcp.c
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@ -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;
}