From: Arjan van de Ven <arjan@infradead.org>
To: Hugh Dickins <hugh@veritas.com>
Cc: linux-kernel@vger.kernel.org, htejun@gmail.com,
akpm@linux-foundation.org, jens.axboe@oracle.com
Subject: Re: [PATCH] Fix kunmap() argument in sg_miter_stop
Date: Sat, 15 Nov 2008 12:27:46 -0800 [thread overview]
Message-ID: <20081115122746.75a0f2e3@infradead.org> (raw)
In-Reply-To: <Pine.LNX.4.64.0811152003360.1618@blonde.site>
On Sat, 15 Nov 2008 20:15:15 +0000 (GMT)
Hugh Dickins <hugh@veritas.com> wrote:
> On Sat, 15 Nov 2008, Arjan van de Ven wrote:
> > >From fd5530ac75a919a20bf7951e90a2b12323e9c0a0 Mon Sep 17 00:00:00
> > >2001
> > From: Arjan van de Ven <arjan@linux.intel.com>
> > Date: Sat, 15 Nov 2008 11:23:58 -0800
> > Subject: [PATCH] Fix kunmap() argument in sg_miter_stop
> >
> > kunmap() takes as argument the struct page that orginally got
> > kmap()'d, however the sg_miter_stop() function passed it the kernel
> > virtual address instead, resulting in "kernel BUG at
> > arch/x86/mm/highmem_32.c:115!"
>
> Your patch looks like a good fix to me, but I don't get how its bug
> would manifest as highmem_32.c:115 - that's a check in
> kunmap_atomic(), whereas you're fixing a bad address to kunmap().
>
blarg
this is a new dimension to "off by one bug" L(
--
Arjan van de Ven Intel Open Source Technology Centre
For development, discussion and tips for power savings,
visit http://www.lesswatts.org
next prev parent reply other threads:[~2008-11-15 20:27 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-11-15 19:27 [PATCH] Fix kunmap() argument in sg_miter_stop Arjan van de Ven
2008-11-15 20:15 ` Hugh Dickins
2008-11-15 20:27 ` Arjan van de Ven [this message]
2008-11-15 20:39 ` Arjan van de Ven
2008-11-16 5:16 ` Tejun Heo
2008-11-17 8:11 ` Jens Axboe
2008-11-17 8:22 ` Ingo Molnar
2008-11-17 8:30 ` Jens Axboe
2008-11-17 8:50 ` Ingo Molnar
2008-11-17 8:58 ` Jens Axboe
2008-11-17 9:34 ` Jens Axboe
2008-11-17 9:41 ` Ingo Molnar
2008-11-17 9:45 ` Jens Axboe
2008-11-17 11:13 ` Jens Axboe
2008-11-17 17:08 ` Jeremy Fitzhardinge
2008-11-17 17:10 ` Ingo Molnar
2008-11-17 17:15 ` Jeremy Fitzhardinge
2008-11-17 17:25 ` Linus Torvalds
2008-11-17 17:35 ` Jeremy Fitzhardinge
2008-11-17 18:14 ` [PATCH] xen: fix scrub_page() Ingo Molnar
2008-11-17 18:07 ` [PATCH] Fix kunmap() argument in sg_miter_stop Jens Axboe
2008-11-17 18:16 ` Linus Torvalds
2008-11-17 18:26 ` Jens Axboe
2008-11-18 8:27 ` Ingo Molnar
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