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

[Mel Gorman]

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);
 	unlock_page(page);
-- 
1.7.1

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