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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>
This commit is contained in:
Nick Piggin 2010-07-20 13:24:25 -07:00 committed by Linus Torvalds
parent c61284e991
commit a6aa62a090
1 changed files with 1 additions and 1 deletions
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2
mm/vmscan.c
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@ -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);