netdev - Re: [patch] rds: fix an integer overflow test in rds_info

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Message-Id: <20150803.152028.229112174649764798.davem@davemloft.net>
Date:	Mon, 03 Aug 2015 15:20:28 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	dan.carpenter@...cle.com
Cc:	chien.yen@...cle.com, agrover@...hat.com, rds-devel@....oracle.com,
	netdev@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [patch] rds: fix an integer overflow test in
 rds_info_getsockopt()

From: Dan Carpenter <dan.carpenter@...cle.com>
Date: Sat, 1 Aug 2015 15:33:26 +0300

> "len" is a signed integer.  We check that len is not negative, so it
> goes from zero to INT_MAX.  PAGE_SIZE is unsigned long so the comparison
> is type promoted to unsigned long.  ULONG_MAX - 4095 is a higher than
> INT_MAX so the condition can never be true.
> 
> I don't know if this is harmful but it seems safe to limit "len" to
> INT_MAX - 4095.
> 
> Fixes: a8c879a7ee98 ('RDS: Info and stats')
> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>

Applied, thanks Dan.
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