netdev - Re: [patch] net/sched: potential data corruption

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Date:	Tue, 13 Jul 2010 11:58:14 -0400
From:	jamal <hadi@...erus.ca>
To:	Dan Carpenter <error27@...il.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Stephen Hemminger <shemminger@...tta.com>,
	netdev@...r.kernel.org, kernel-janitors@...r.kernel.org,
	matthew@....cx
Subject: Re: [patch] net/sched: potential data corruption

On Tue, 2010-07-13 at 15:21 +0200, Dan Carpenter wrote:
> The reset_policy() does:
>         memset(d->tcfd_defdata, 0, SIMP_MAX_DATA);
>         strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA);
> 
> In the original code, the size of d->tcfd_defdata wasn't fixed and if
> strlen(defdata) was less than 31, reset_policy() would cause memory
> corruption.
> 
> Please Note:  The original alloc_defdata() assumes defdata is 32
> characters and a NUL terminator while reset_policy() assumes defdata is
> 31 characters and a NUL.  This patch updates alloc_defdata() to match
> reset_policy() (ie a shorter string).  I'm not very familiar with this
> code so please review carefully.
> 
> Signed-off-by: Dan Carpenter <error27@...il.com>


Acked-by: Jamal Hadi Salim <hadi@...erus.ca>


cheers,
jamal

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