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-Tag: v5.9.11~9
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=52fb03b1369e53a55264a03fc1dd4eb637f3f67c;p=thirdparty%2Fkernel%2Fstable.git

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 c85fbb666e40a..5f965fabb5313 100644
--- 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);
 	}
 }