Thread (6 messages) 6 messages, 3 authors, 2010-12-25

Re: [PATCH] Ceph: Fix a use-after-free bug in ceph_destroy_client().

From: Jesper Juhl <hidden>
Date: 2010-12-25 21:45:06
Also in: ceph-devel, lkml

On Sat, 25 Dec 2010, richard -rw- weinberger wrote:
On Sat, Dec 25, 2010 at 10:24 PM, Jesper Juhl [off-list ref] wrote:
quoted
On Sat, 25 Dec 2010, richard -rw- weinberger wrote:
quoted
On Sat, Dec 25, 2010 at 7:17 PM, Jesper Juhl [off-list ref] wrote:
quoted
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?
Your patch does not fix a bug.
I would say it's a style fix.
At this point in time I'd agree. :-)

-- 
Jesper Juhl [off-list ref]            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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