linux-kernel - [PATCH 01/14] vmscan: Fix mapping use after free

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Date:	Tue, 29 Jun 2010 12:34:35 +0100
From:	Mel Gorman <mel@....ul.ie>
To:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-mm@...ck.org
Cc:	Dave Chinner <david@...morbit.com>,
	Chris Mason <chris.mason@...cle.com>,
	Nick Piggin <npiggin@...e.de>, Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Christoph Hellwig <hch@...radead.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Mel Gorman <mel@....ul.ie>
Subject: [PATCH 01/14] vmscan: Fix mapping use after free

From: Nick Piggin <npiggin@...e.de>

Use lock_page_nosync in handle_write_error as after writepage we have no
reference to the mapping when taking the page lock.

Signed-off-by: Nick Piggin <npiggin@...e.de>
Signed-off-by: Mel Gorman <mel@....ul.ie>
---
 mm/vmscan.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 9c7e57c..62a30fe 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -296,7 +296,7 @@ static int may_write_to_queue(struct backing_dev_info *bdi)
 static void handle_write_error(struct address_space *mapping,
 				struct page *page, int error)
 {
-	lock_page(page);
+	lock_page_nosync(page);
 	if (page_mapping(page) == mapping)
 		mapping_set_error(mapping, error);
 	unlock_page(page);
-- 
1.7.1

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