Btrfs: use kmem_cache_free when freeing entry in inode cache

[ Upstream commit c3f4a1685bb87e59c886ee68f7967eae07d4dffa ]

The free space entries are allocated using kmem_cache_zalloc(),
through __btrfs_add_free_space(), therefore we should use
kmem_cache_free() and not kfree() to avoid any confusion and
any potential problem. Looking at the kfree() definition at
mm/slab.c it has the following comment:

  /*
   * (...)
   *
   * Don't free memory not originally allocated by kmalloc()
   * or you will run into trouble.
   */

So better be safe and use kmem_cache_free().

Cc: stable@vger.kernel.org
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <clm@fb.com>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>

diff --git a/fs/btrfs/inode-map.c b/fs/btrfs/inode-map.c
index 83d646bd2e4b90f34bd597b8ba6f6244071e48f1..ed2de833dd18e329ed978505bdc4985cfe409a99 100644 (file)
--- a/fs/btrfs/inode-map.c
+++ b/fs/btrfs/inode-map.c
@@ -271,7 +271,7 @@ void btrfs_unpin_free_ino(struct btrfs_root *root)
                __btrfs_add_free_space(ctl, info->offset, count);
 free:
                rb_erase(&info->offset_index, rbroot);
-               kfree(info);
+               kmem_cache_free(btrfs_free_space_cachep, info);
        }
 }