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Commit a6aa62a0 authored by Nick Piggin's avatar Nick Piggin Committed by Linus Torvalds
Browse files

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: default avatarNick Piggin <npiggin@suse.de>
Reviewed-by: default avatarJohannes Weiner <hannes@cmpxchg.org>
Cc: Mel Gorman <mel@csn.ul.ie>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent c61284e9

mm/vmscan.c

+1 −1
Original line number Diff line number Diff line
@@ -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);