blk-cgroup: fix a hd_struct leak in blkcg_fill_root_iostats

commit b7131ee0bac5e5df73e4098e77bbddb3a31d06ff upstream.

disk_get_part needs to be paired with a disk_put_part.

Cc: stable@vger.kernel.org
Fixes: ef45fe470e1 ("blk-cgroup: show global disk stats in root cgroup io.stat")
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index c85fbb666e40a03c84e4a687fb0fe9b2ee80af0a..5f965fabb5313e9030e50fc8322dca92786343d9 100644 (file)
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -840,6 +840,7 @@ static void blkcg_fill_root_iostats(void)
                        blkg_iostat_set(&blkg->iostat.cur, &tmp);
                        u64_stats_update_end(&blkg->iostat.sync);
                }
+               disk_put_part(part);
        }
 }