From: Andrew Morton <akpm@linux-foundation.org>
To: Bob Liu <lliubbo@gmail.com>
Cc: gerg@snapgear.com, dhowells@redhat.com, lethal@linux-sh.org,
geert@linux-m68k.org, vapier@gentoo.org, linux-mm@kvack.org
Subject: Re: [PATCH] mm: nommu: fix remap_pfn_range()
Date: Fri, 27 May 2011 15:12:04 -0700 [thread overview]
Message-ID: <20110527151204.4e60426e.akpm@linux-foundation.org> (raw)
In-Reply-To: <1306468203-8683-1-git-send-email-lliubbo@gmail.com>
On Fri, 27 May 2011 11:50:03 +0800
Bob Liu <lliubbo@gmail.com> wrote:
> remap_pfn_range() does not update vma->end on no mmu arch which will
> cause munmap() fail because it can't match the vma.
>
> eg. fb_mmap() in fbmem.c will call io_remap_pfn_range() which is
> remap_pfn_range() on nommu arch, if an address is not page aligned vma->start
> will be changed in remap_pfn_range(), but neither size nor vma->end will be
> updated. Then munmap(start, len) can't find the vma to free, because it need to
> compare (start + len) with vma->end.
>
Also, I tagged the patch (or its successor) for -stable backporting as
the problem appears to be present in 2.6.38 (at least).
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prev parent reply other threads:[~2011-05-27 22:12 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-27 3:50 [PATCH] mm: nommu: fix remap_pfn_range() Bob Liu
2011-05-27 22:09 ` Andrew Morton
2011-06-02 6:19 ` Bob Liu
2011-05-27 22:12 ` Andrew Morton [this message]
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