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authorMinchan Kim <minchan.kim@gmail.com>2011-02-01 15:52:33 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2011-02-02 16:03:18 -0800
commit48db54ee2f41e8ae2faf330b55db34a9fffb5b3c (patch)
tree5cdf936bf6996e379784e0b75b982a364f437368 /mm/memory-failure.c
parent57fc4a5ee322cde96c33f101d3c2d3b79011c05c (diff)
downloadlinux-48db54ee2f41e8ae2faf330b55db34a9fffb5b3c.tar.gz
mm/migration: fix page corruption during hugepage migration
If migrate_huge_page by memory-failure fails , it calls put_page in itself to decrease page reference and caller of migrate_huge_page also calls putback_lru_pages. It can do double free of page so it can make page corruption on page holder. In addtion, clean of pages on caller is consistent behavior with migrate_pages by cf608ac19c ("mm: compaction: fix COMPACTPAGEFAILED counting"). Signed-off-by: Minchan Kim <minchan.kim@gmail.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Christoph Lameter <cl@linux.com> 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/memory-failure.c')
-rw-r--r--mm/memory-failure.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 75398b0bfed..237aaa488f4 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -1295,7 +1295,10 @@ static int soft_offline_huge_page(struct page *page, int flags)
ret = migrate_huge_pages(&pagelist, new_page, MPOL_MF_MOVE_ALL, 0,
true);
if (ret) {
- putback_lru_pages(&pagelist);
+ struct page *page1, *page2;
+ list_for_each_entry_safe(page1, page2, &pagelist, lru)
+ put_page(page1);
+
pr_debug("soft offline: %#lx: migration failed %d, type %lx\n",
pfn, ret, page->flags);
if (ret > 0)