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

From: Mel Gorman
Date: Tue Jun 29 2010 - 07:37:16 EST

From: Nick Piggin <npiggin@xxxxxxx>

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@xxxxxxx>
Signed-off-by: Mel Gorman <mel@xxxxxxxxx>
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);

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