linux-kernel - [34-longterm 127/260] net/llc: make opt unsigned in llc_ui

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Date:	Sun,  2 Jan 2011 02:17:03 -0500
From:	Paul Gortmaker <paul.gortmaker@...driver.com>
To:	stable@...nel.org, linux-kernel@...r.kernel.org
Cc:	stable-review@...nel.org, Dan Carpenter <error27@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Paul Gortmaker <paul.gortmaker@...driver.com>
Subject: [34-longterm 127/260] net/llc: make opt unsigned in llc_ui_setsockopt()

From: Dan Carpenter <error27@...il.com>

commit 339db11b219f36cf7da61b390992d95bb6b7ba2e upstream.

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".

Signed-off-by: Dan Carpenter <error27@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Paul Gortmaker <paul.gortmaker@...driver.com>
---
 net/llc/af_llc.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/net/llc/af_llc.c b/net/llc/af_llc.c
index 2db6a9f..ad4296c 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)))
-- 
1.7.3.3

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