[PATCH 3.16 106/233] btrfs: fix memory leak in update_space_info failure path

[Ben Hutchings]

3.16.48-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Jeff Mahoney <je...@suse.com>

commit 896533a7da929136d0432713f02a3edffece2826 upstream.

If we fail to add the space_info kobject, we'll leak the memory
for the percpu counter.

Fixes: 6ab0a2029c (btrfs: publish allocation data in sysfs)
Signed-off-by: Jeff Mahoney <je...@suse.com>
Reviewed-by: Liu Bo <bo.li....@oracle.com>
Signed-off-by: David Sterba <dste...@suse.com>
Signed-off-by: Ben Hutchings <b...@decadent.org.uk>
---
 fs/btrfs/extent-tree.c | 1 +
 1 file changed, 1 insertion(+)

--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -3526,6 +3526,7 @@ static int update_space_info(struct btrf
                                    info->space_info_kobj, "%s",
                                    alloc_name(found->flags));
        if (ret) {
+               percpu_counter_destroy(&found->total_bytes_pinned);
                kfree(found);
                return ret;
        }