netdev - [PATCH] net: Check the argument for listen(2)

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Message-Id: <1372436076-61436-1-git-send-email-xiaosuo@gmail.com>
Date:	Sat, 29 Jun 2013 00:14:36 +0800
From:	Changli Gao <xiaosuo@...il.com>
To:	"David S. Miller" <davem@...emloft.net>
Cc:	Changli Gao <xiaosuo@...il.com>, netdev@...r.kernel.org
Subject: [PATCH] net: Check the argument for listen(2)

As we use u16 to save the value of the argument for listen(2),
we'd better check if the value is larger than SINT_MAX other
than cut it down silently on error.
---
 net/ipv4/af_inet.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
index b4d0be2..35aaf00 100644
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -198,6 +198,9 @@ int inet_listen(struct socket *sock, int backlog)
 	unsigned char old_state;
 	int err;
 
+	if (backlog >= (1 << 16))
+		return EINVAL;
+
 	lock_sock(sk);
 
 	err = -EINVAL;
-- 
1.7.9.5

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