From ad381c21f49cc127b7dc06fe17648b13c6a8cf99 Mon Sep 17 00:00:00 2001 From: Yu Kuai Date: Wed, 31 May 2023 15:51:53 +0800 Subject: [PATCH] block: fix wrong mode for blkdev_put() from disk_scan_partitions() mainline inclusion from mainline-v6.3-rc2 commit 428913bce1e67ccb4dae317fd0332545bf8c9233 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I6MQLP CVE: NA Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e5cfefa97bccf956ea0bb6464c1f6c84fd7a8d9f -------------------------------- 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 Reviewed-by: Hou Tao Signed-off-by: Jialin Zhang --- block/genhd.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/block/genhd.c b/block/genhd.c index b6ad3554876f..3c34dd011585 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -768,7 +768,7 @@ 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(claim, claim, disk_scan_partitions); -- GitLab