Btrfs: fix memory leak of chunks' extent map

commit 7d3d1744f8a7d62e4875bd69cc2192a939813880 upstream.

As we're hold a ref on looking up the extent map, we need to drop the ref
before returning to callers.

Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 8bffb9174afb..b6c23c4abae2 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -4248,6 +4248,7 @@ int btrfs_num_copies(struct btrfs_fs_info *fs_info, u64 logical, u64 len)
                 btrfs_emerg(fs_info, "Invalid mapping for %Lu-%Lu, got "
                             "%Lu-%Lu\n", logical, logical+len, em->start,
                             em->start + em->len);
+                free_extent_map(em);
                 return 1;
         }
 
@@ -4429,6 +4430,7 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
                 btrfs_crit(fs_info, "found a bad mapping, wanted %Lu, "
                            "found %Lu-%Lu\n", logical, em->start,
                            em->start + em->len);
+                free_extent_map(em);
                 return -EINVAL;
         }