From 428913bce1e67ccb4dae317fd0332545bf8c9233 Mon Sep 17 00:00:00 2001 From: Yu Kuai Date: Tue, 7 Mar 2023 18:55:52 +0800 Subject: block: fix wrong mode for blkdev_put() from disk_scan_partitions() If disk_scan_partitions() is called with 'FMODE_EXCL', blkdev_get_by_dev() will be called without 'FMODE_EXCL', however, follow blkdev_put() is still called with 'FMODE_EXCL', which will cause 'bd_holders' counter to leak. Fix the problem by using the right mode for blkdev_put(). Reported-by: syzbot+2bcc0d79e548c4f62a59@syzkaller.appspotmail.com Link: https://lore.kernel.org/lkml/f9649d501bc8c3444769418f6c26263555d9d3be.camel@linux.ibm.com/T/ Tested-by: Julian Ruess Fixes: e5cfefa97bcc ("block: fix scan partition for exclusively open device again") Signed-off-by: Yu Kuai Reviewed-by: Jan Kara Signed-off-by: Jens Axboe --- block/genhd.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'block/genhd.c') diff --git a/block/genhd.c b/block/genhd.c index 3ee5577e1586..02d9cfb9e077 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -385,7 +385,7 @@ int disk_scan_partitions(struct gendisk *disk, fmode_t mode) if (IS_ERR(bdev)) ret = PTR_ERR(bdev); else - blkdev_put(bdev, mode); + blkdev_put(bdev, mode & ~FMODE_EXCL); if (!(mode & FMODE_EXCL)) bd_abort_claiming(disk->part0, disk_scan_partitions); -- cgit v1.2.3