[PATCH] page_mkwrite caller race fix

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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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Hugh Dickins 2007-02-10 01:43:00 -08:00 • committed by Linus Torvalds

parent f05b6284ee

commit c3704ceb4a

1 changed files with 1 additions and 2 deletions

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mm/memory.c

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