linux-kernel - [PATCH 61/78] net: mac802154: comparision issue of type cast, finding by EXTRA

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Date:	Tue, 28 May 2013 14:20:10 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Chen Gang <gang.chen@...anux.com>,
	"David S. Miller" <davem@...emloft.net>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 61/78] net: mac802154: comparision issue of type cast, finding by EXTRA_CFLAGS=-W

3.8.13.1 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Chen Gang <gang.chen@...anux.com>

[ Upstream commit 2c1bbbffa0b644fab4f91878cde0c2e8f52e2dcc ]

Change MAC802154_CHAN_NONE from ~(u8)0 to 0xff, or the comparison in
mac802154_wpan_xmit() for ``chan == MAC802154_CHAN_NONE'' will not
succeed.

This bug can be boiled down to ``u8 foo = 0xff; if (foo == ~(u8)0)
[...] else [...]'' where the condition will always take the else
branch.

Signed-off-by: Chen Gang <gang.chen@...anux.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 net/mac802154/mac802154.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/mac802154/mac802154.h b/net/mac802154/mac802154.h
index a4dcaf1..703c121 100644
--- a/net/mac802154/mac802154.h
+++ b/net/mac802154/mac802154.h
@@ -90,7 +90,7 @@ struct mac802154_sub_if_data {
 
 #define MAC802154_MAX_XMIT_ATTEMPTS	3
 
-#define MAC802154_CHAN_NONE		(~(u8)0) /* No channel is assigned */
+#define MAC802154_CHAN_NONE		0xff /* No channel is assigned */
 
 extern struct ieee802154_reduced_mlme_ops mac802154_mlme_reduced;
 extern struct ieee802154_mlme_ops mac802154_mlme_wpan;
-- 
1.8.1.2

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