linux-kernel - [PATCH 4.9 142/206] mm: khugepaged: fix radix tree node leak in shmem collapse error path

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Date:   Tue, 10 Jan 2017 14:37:05 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Johannes Weiner <hannes@...xchg.org>,
        Jan Kara <jack@...e.cz>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Hugh Dickins <hughd@...gle.com>,
        Matthew Wilcox <mawilcox@...uxonhyperv.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [PATCH 4.9 142/206] mm: khugepaged: fix radix tree node leak in shmem collapse error path

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Johannes Weiner <hannes@...xchg.org>

commit 59749e6ce53735d8b696763742225f126e94603f upstream.

The radix tree counts valid entries in each tree node.  Entries stored
in the tree cannot be removed by simpling storing NULL in the slot or
the internal counters will be off and the node never gets freed again.

When collapsing a shmem page fails, restore the holes that were filled
with radix_tree_insert() with a proper radix tree deletion.

Fixes: f3f0e1d2150b ("khugepaged: add support of collapse for tmpfs/shmem pages")
Link: http://lkml.kernel.org/r/20161117191138.22769-3-hannes@cmpxchg.org
Signed-off-by: Johannes Weiner <hannes@...xchg.org>
Reported-by: Jan Kara <jack@...e.cz>
Acked-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
Reviewed-by: Jan Kara <jack@...e.cz>
Cc: Hugh Dickins <hughd@...gle.com>
Cc: Matthew Wilcox <mawilcox@...uxonhyperv.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 mm/khugepaged.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -1525,9 +1525,11 @@ tree_unlocked:
 			if (!page || iter.index < page->index) {
 				if (!nr_none)
 					break;
-				/* Put holes back where they were */
-				radix_tree_replace_slot(slot, NULL);
 				nr_none--;
+				/* Put holes back where they were */
+				radix_tree_delete(&mapping->page_tree,
+						  iter.index);
+				slot = radix_tree_iter_next(&iter);
 				continue;
 			}