linux-kernel - [ 66/68] mm: Hold a file reference in madvise

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Date:	Thu, 12 Jul 2012 16:02:40 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Greg KH <gregkh@...uxfoundation.org>,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Hugh Dickins <hugh@...itas.com>,
	Miklos Szeredi <mszeredi@...e.cz>,
	Badari Pulavarty <pbadari@...ibm.com>,
	Nick Piggin <npiggin@...e.de>,
	Ben Hutchings <ben@...adent.org.uk>,
	Andy Lutomirski <luto@...capital.net>
Subject: [ 66/68] mm: Hold a file reference in madvise_remove

From: Greg KH <gregkh@...uxfoundation.org>

3.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Andy Lutomirski <luto@...capital.net>

commit 9ab4233dd08036fe34a89c7dc6f47a8bf2eb29eb upstream.

Otherwise the code races with munmap (causing a use-after-free
of the vma) or with close (causing a use-after-free of the struct
file).

The bug was introduced by commit 90ed52ebe481 ("[PATCH] holepunch: fix
mmap_sem i_mutex deadlock")

[bwh: Backported to 3.2:
 - Adjust context
 - madvise_remove() calls vmtruncate_range(), not do_fallocate()]
[luto: Backported to 3.0: Adjust context]

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