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Btrfs: fix extent state leak from tree log

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It's possible that btrfs_sync_log() bails out after one of the two
btrfs_write_marked_extents() which convert extent state's state bit into
EXTENT_NEED_WAIT from EXTENT_DIRTY/EXTENT_NEW, however only EXTENT_DIRTY
and EXTENT_NEW are searched by free_log_tree() so that those extent states
with EXTENT_NEED_WAIT lead to memory leak.

cc: <stable@vger.kernel.org>
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Reviewed-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Liu Bo 2018-01-25 11:02:52 -07:00 committed by David Sterba
parent 1846430c24
commit 55237a5f24
1 changed files with 3 additions and 2 deletions
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5
fs/btrfs/tree-log.c
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@ -3026,13 +3026,14 @@ static void free_log_tree(struct btrfs_trans_handle *trans,
while (1) {
ret = find_first_extent_bit(&log->dirty_log_pages,
0, &start, &end, EXTENT_DIRTY | EXTENT_NEW,
0, &start, &end,
EXTENT_DIRTY | EXTENT_NEW | EXTENT_NEED_WAIT,
NULL);
if (ret)
break;
clear_extent_bits(&log->dirty_log_pages, start, end,
EXTENT_DIRTY | EXTENT_NEW);
EXTENT_DIRTY | EXTENT_NEW | EXTENT_NEED_WAIT);
}
/*