linux-kernel - Re: [PATCH] drivers/net/wimax/i2400m/fw.c fix possible double free

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Message-ID: <1268902008.10536.41.camel@ICE-BOX>
Date:	Thu, 18 Mar 2010 19:46:48 +1100
From:	Darren Jenkins <darrenrjenkins@...il.com>
To:	Inaky Perez-Gonzalez <inaky.perez-gonzalez@...el.com>
Cc:	David Miller <davem@...emloft.net>,
	linux-wimax <linux-wimax@...el.com>,
	"kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>,
	"Kao, Cindy H" <cindy.h.kao@...el.com>,
	"Brandewie, Dirk J" <dirk.j.brandewie@...el.com>,
	"wimax@...uxwimax.org" <wimax@...uxwimax.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drivers/net/wimax/i2400m/fw.c fix possible double free


On Thu, Mar 18, 2010 at 9:10 AM, Inaky Perez-Gonzalez
<inaky.perez-gonzalez@...el.com> wrote:

> If krealloc() fails to aallocate a new pointer, the old block is
> unmodified, so by doing this you are leaking a buffer allocation.

It seems you are right.
So now understanding correctly how krealloc() works I can see that the
double kfree() can only actually happen if the el_size parameter to
i2400m_zrealloc_2x() is zero, and it isn't at the two call sites.

So this was a false positive and I am sorry for the noise.

Darren J.


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