linux-kernel - Re: [PATCH] Ceph: Fix a use-after-free bug in ceph_destroy

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Message-ID: <alpine.LNX.2.00.1012252223380.10759@swampdragon.chaosbits.net>
Date:	Sat, 25 Dec 2010 22:24:57 +0100 (CET)
From:	Jesper Juhl <jj@...osbits.net>
To:	richard -rw- weinberger <richard.weinberger@...il.com>
cc:	ceph-devel@...r.kernel.org, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, Sage Weil <sage@...dream.net>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH] Ceph: Fix a use-after-free bug in
 ceph_destroy_client().

On Sat, 25 Dec 2010, richard -rw- weinberger wrote:

> On Sat, Dec 25, 2010 at 7:17 PM, Jesper Juhl <jj@...osbits.net> wrote:
> > Hello,
> >
> > In net/ceph/ceph_common.c::ceph_destroy_client() the pointer 'client' is
> > freed by kfree() and subsequently used in a call to dout() - use after
> > free bug.
> 
> Not really. %p reads only the address of "client".
> kfree() does not alter this address.
> 

Ok, I see your point and you are correct. But still, the patch does not 
change behaviour and it makes it absolutely clear that there's no 
use-after-free bug, so it might still have merit... or?

-- 
Jesper Juhl <jj@...osbits.net>            http://www.chaosbits.net/
Don't top-post http://www.catb.org/~esr/jargon/html/T/top-post.html
Plain text mails only, please.

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