[PATCH 3.10 75/78] Btrfs: fix memory leak of chunks extent map

[Greg Kroah-Hartman]

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

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

From: Liu Bo <bo.li.liu@xxxxxxxxxx>

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@xxxxxxxxxx>
Signed-off-by: Josef Bacik <jbacik@xxxxxxxxxxxx>
Signed-off-by: Chris Mason <chris.mason@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 fs/btrfs/volumes.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -4248,6 +4248,7 @@ int btrfs_num_copies(struct btrfs_fs_inf
 		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 btrf
 		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;
 	}
 


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