linux-kernel - [PATCH] Change judgment len position

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Date:   Wed, 24 Oct 2018 23:47:29 +0800
From:   Wang Hai <wanghaifine@...il.com>
To:     edumazet@...gle.com
Cc:     davem@...emloft.net, kuznet@....inr.ac.ru, yoshfuji@...ux-ipv6.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Wang Hai <wanghaifine@...il.com>
Subject: [PATCH] Change judgment len position

To determine whether len is less than zero, it should be put before 
the function min_t, because the return value of min_t is not likely 
to be less than zero.

Signed-off-by: Wang Hai <wanghaifine@...il.com>
---
 net/ipv4/tcp.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 10c624639..49af9fdc3 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -3301,11 +3301,11 @@ static int do_tcp_getsockopt(struct sock *sk, int level,
 	struct net *net = sock_net(sk);
 	int val, len;
 
+	len = min_t(unsigned int, len, sizeof(int));
+
 	if (get_user(len, optlen))
 		return -EFAULT;
 
-	len = min_t(unsigned int, len, sizeof(int));
-
 	if (len < 0)
 		return -EINVAL;
 
-- 
2.17.1