netdev - [patch] net/llc: make opt unsigned in llc_ui

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Message-ID: <20100910115616.GD5959@bicker>
Date:	Fri, 10 Sep 2010 13:56:16 +0200
From:	Dan Carpenter <error27@...il.com>
To:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Octavian Purdila <opurdila@...acom.com>,
	Stephen Hemminger <shemminger@...tta.com>,
	Eric Dumazet <eric.dumazet@...il.com>, netdev@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [patch] net/llc: make opt unsigned in llc_ui_setsockopt()

The members of struct llc_sock are unsigned so if we pass a negative
value for "opt" it can cause a sign bug.  Also it can cause an integer
overflow when we multiply "opt * HZ".

CC: stable@...nel.org
Signed-off-by: Dan Carpenter <error27@...il.com>

diff --git a/net/llc/af_llc.c b/net/llc/af_llc.c
index 023ba82..5826129 100644
--- a/net/llc/af_llc.c
+++ b/net/llc/af_llc.c
@@ -1024,7 +1024,8 @@ static int llc_ui_setsockopt(struct socket *sock, int level, int optname,
 {
 	struct sock *sk = sock->sk;
 	struct llc_sock *llc = llc_sk(sk);
-	int rc = -EINVAL, opt;
+	unsigned int opt;
+	int rc = -EINVAL;
 
 	lock_sock(sk);
 	if (unlikely(level != SOL_LLC || optlen != sizeof(int)))
--
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