linux-kernel - [PATCH 3.10 10/45] inetdevice: fixed signed integer overflow

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Message-Id: <20141205223318.336100025@linuxfoundation.org>
Date:	Fri,  5 Dec 2014 14:44:53 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org,
	Vincent BENAYOUN <vincent.benayoun@...st-in-soft.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [PATCH 3.10 10/45] inetdevice: fixed signed integer overflow

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

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

From: Vincent BENAYOUN <vincent.benayoun@...st-in-soft.com>

[ Upstream commit 84bc88688e3f6ef843aa8803dbcd90168bb89faf ]

There could be a signed overflow in the following code.

The expression, (32-logmask) is comprised between 0 and 31 included.
It may be equal to 31.
In such a case the left shift will produce a signed integer overflow.
According to the C99 Standard, this is an undefined behavior.
A simple fix is to replace the signed int 1 with the unsigned int 1U.

Signed-off-by: Vincent BENAYOUN <vincent.benayoun@...st-in-soft.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 include/linux/inetdevice.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/include/linux/inetdevice.h
+++ b/include/linux/inetdevice.h
@@ -261,7 +261,7 @@ static inline void in_dev_put(struct in_
 static __inline__ __be32 inet_make_mask(int logmask)
 {
 	if (logmask)
-		return htonl(~((1<<(32-logmask))-1));
+		return htonl(~((1U<<(32-logmask))-1));
 	return 0;
 }
 


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