linux-kernel - Re: Linux 2.6.37-rc1 (floppy module load: no device found)

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Message-ID: <AANLkTinrkpf=aYcB_987_5dfPPLUG2mdEF4UDQ-ZpJCZ@mail.gmail.com>
Date:	Sat, 6 Nov 2010 07:52:15 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	Randy Dunlap <randy.dunlap@...cle.com>,
	Jens Axboe <jaxboe@...ionio.com>,
	David Miller <davem@...emloft.net>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Linux 2.6.37-rc1 (floppy module load: no device found)

On Sat, Nov 6, 2010 at 5:16 AM, Vivek Goyal <vgoyal@...hat.com> wrote:
>
> While scanning the floopy code, I found one more instance of trying to
> access disk->queue pointer after doing put_disk() on gendisk. For some
> reason, floppy moule still loads/unloads fine. May be object is still
> around with right pointer values.

Yes - the normal use-after-free is fairly silent and only causes
problems if something re-allocates the same memory immediately, which
is quite a small race to hit under normal load.

But if you had had slab poisoning on, you'd have seen the same oops
Randy did (well, not the exact same one since the call trace would be
slightly different due to being from a different point, but _very_
similar).

Anyway, applied.

                        Linus
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