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authorNick Piggin <npiggin@suse.de>2010-07-20 20:24:25 (GMT)
committerLinus Torvalds <torvalds@linux-foundation.org>2010-07-20 23:25:40 (GMT)
commita6aa62a0909b9ccb1f8b0d2653920ba071037972 (patch)
tree2df66e9a20cdb8fac10a1979c6b678e98ee67f0a /mm/vmscan.c
parentc61284e99191b2284fb74dae6961d4d09e4e59e8 (diff)
mm/vmscan.c: fix mapping use after free
We need lock_page_nosync() here because we have no reference to the mapping when taking the page lock. Signed-off-by: Nick Piggin <npiggin@suse.de> Reviewed-by: Johannes Weiner <hannes@cmpxchg.org> Cc: Mel Gorman <mel@csn.ul.ie> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/vmscan.c')
-rw-r--r--mm/vmscan.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 199fa43..b94fe1b 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -298,7 +298,7 @@ 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);

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