From: Christoph Hellwig <hch@lst.de>
Date: Sat, 14 Nov 2020 18:12:46 +0000 (+0100)
Subject: blk-cgroup: fix a hd_struct leak in blkcg_fill_root_iostats
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=b7131ee0bac5e5df73e4098e77bbddb3a31d06ff;p=linux.git

blk-cgroup: fix a hd_struct leak in blkcg_fill_root_iostats

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>
---

diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index c68bdf58c9a6e..54fbe1e80cc41 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -849,6 +849,7 @@ 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);
 	}
 }