From 48db54ee2f41e8ae2faf330b55db34a9fffb5b3c Mon Sep 17 00:00:00 2001
From: Minchan Kim <minchan.kim@gmail.com>
Date: Tue, 1 Feb 2011 15:52:33 -0800
Subject: 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>
---
 mm/migrate.c | 4 ----
 1 file changed, 4 deletions(-)

(limited to 'mm/migrate.c')

diff --git a/mm/migrate.c b/mm/migrate.c
index 155a2e9a805..76611525380 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -980,10 +980,6 @@ int migrate_huge_pages(struct list_head *from,
 	}
 	rc = 0;
 out:
-
-	list_for_each_entry_safe(page, page2, from, lru)
-		put_page(page);
-
 	if (rc)
 		return rc;
 
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