linux-kernel - [PATCH 5.9 244/252] blk-cgroup: fix a hd_struct leak in blkcg_fill_root

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Message-Id: <20201123121847.356844127@linuxfoundation.org>
Date:   Mon, 23 Nov 2020 13:23:14 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Christoph Hellwig <hch@....de>,
        Jens Axboe <axboe@...nel.dk>
Subject: [PATCH 5.9 244/252] blk-cgroup: fix a hd_struct leak in blkcg_fill_root_iostats

From: Christoph Hellwig <hch@....de>

commit b7131ee0bac5e5df73e4098e77bbddb3a31d06ff upstream.

disk_get_part needs to be paired with a disk_put_part.

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

---
 block/blk-cgroup.c |    1 +
 1 file changed, 1 insertion(+)

--- 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);
 	}
 }