From: Hugh Dickins <hugh@veritas.com>
Date: Sat, 10 Feb 2007 09:43:00 +0000 (-0800)
Subject: [PATCH] page_mkwrite caller race fix
X-Git-Tag: v2.6.21-rc1~274^2~472
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c3704ceb4ad055b489b143f4e37c57d128908012;p=pandora-kernel.git

[PATCH] page_mkwrite caller race fix

After do_wp_page has tested page_mkwrite, it must release old_page after
acquiring page table lock, not before: at some stage that ordering got
reversed, leaving a (very unlikely) window in which old_page might be
truncated, freed, and reused in the same position.

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Acked-by: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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