Commit 523e1d39 authored by Tejun Heo's avatar Tejun Heo Committed by Jens Axboe
Browse files

block: make gendisk hold a reference to its queue 



The following command sequence triggers an oops.

# mount /dev/sdb1 /mnt
# echo 1 > /sys/class/scsi_device/0\:0\:1\:0/device/delete
# umount /mnt

 general protection fault: 0000 [#1] PREEMPT SMP
 CPU 2
 Modules linked in:

 Pid: 791, comm: umount Not tainted 3.1.0-rc3-work+ #8 Bochs Bochs
 RIP: 0010:[<ffffffff810d0879>]  [<ffffffff810d0879>] __lock_acquire+0x389/0x1d60
...
 Call Trace:
  [<ffffffff810d2845>] lock_acquire+0x95/0x140
  [<ffffffff81aed87b>] _raw_spin_lock+0x3b/0x50
  [<ffffffff811573bc>] bdi_lock_two+0x5c/0x70
  [<ffffffff811c2f6c>] bdev_inode_switch_bdi+0x4c/0xf0
  [<ffffffff811c3fcb>] __blkdev_put+0x11b/0x1d0
  [<ffffffff811c4010>] __blkdev_put+0x160/0x1d0
  [<ffffffff811c40df>] blkdev_put+0x5f/0x190
  [<ffffffff8118f18d>] kill_block_super+0x4d/0x80
  [<ffffffff8118f4a5>] deactivate_locked_super+0x45/0x70
  [<ffffffff8119003a>] deactivate_super+0x4a/0x70
  [<ffffffff811ac4ad>] mntput_no_expire+0xed/0x130
  [<ffffffff811acf2e>] sys_umount+0x7e/0x3a0
  [<ffffffff81aeeeab>] system_call_fastpath+0x16/0x1b

This is because bdev holds on to disk but disk doesn't pin the
associated queue.  If a SCSI device is removed while the device is
still open, the sdev puts the base reference to the queue on release.
When the bdev is finally released, the associated queue is already
gone along with the bdi and bdev_inode_switch_bdi() ends up
dereferencing already freed bdi.

Even if it were not for this bug, disk not holding onto the associated
queue is very unusual and error-prone.

Fix it by making add_disk() take an extra reference to its queue and
put it on disk_release() and ensuring that disk and its fops owner are
put in that order after all accesses to the disk and queue are
complete.

Signed-off-by: default avatarTejun Heo <tj@kernel.org>
Cc: stable@kernel.org
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 5c04b426

block/genhd.c

+8 −0
Original line number Diff line number Diff line
@@ -611,6 +611,12 @@ void add_disk(struct gendisk *disk) 
	register_disk(disk);

	blk_register_queue(disk);



	/*

	 * Take an extra ref on queue which will be put on disk_release()

	 * so that it sticks around as long as @disk is there.

	 */

	WARN_ON_ONCE(blk_get_queue(disk->queue));



	retval = sysfs_create_link(&disk_to_dev(disk)->kobj, &bdi->dev->kobj,

				   "bdi");

	WARN_ON(retval);
@@ -1095,6 +1101,8 @@ static void disk_release(struct device *dev) 
	disk_replace_part_tbl(disk, NULL);

	free_part_stats(&disk->part0);

	free_part_info(&disk->part0);

	if (disk->queue)

		blk_put_queue(disk->queue);

	kfree(disk);

}

struct class block_class = {

fs/block_dev.c

+8 −5
Original line number Diff line number Diff line
@@ -1085,6 +1085,7 @@ static int __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part); 
static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)

{

	struct gendisk *disk;

	struct module *owner;

	int ret;

	int partno;

	int perm = 0;
@@ -1110,6 +1111,7 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part) 
	disk = get_gendisk(bdev->bd_dev, &partno);

	if (!disk)

		goto out;

	owner = disk->fops->owner;



	disk_block_events(disk);

	mutex_lock_nested(&bdev->bd_mutex, for_part);
@@ -1137,8 +1139,8 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part) 
					bdev->bd_disk = NULL;

					mutex_unlock(&bdev->bd_mutex);

					disk_unblock_events(disk);

					module_put(disk->fops->owner);

					put_disk(disk);

					module_put(owner);

					goto restart;

				}

			}
@@ -1194,8 +1196,8 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part) 
				goto out_unlock_bdev;

		}

		/* only one opener holds refs to the module and disk */

		module_put(disk->fops->owner);

		put_disk(disk);

		module_put(owner);

	}

	bdev->bd_openers++;

	if (for_part)
@@ -1215,8 +1217,8 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part) 
 out_unlock_bdev:

	mutex_unlock(&bdev->bd_mutex);

	disk_unblock_events(disk);

	module_put(disk->fops->owner);

	put_disk(disk);

	module_put(owner);

 out:

	bdput(bdev);
@@ -1442,14 +1444,15 @@ static int __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part) 
	if (!bdev->bd_openers) {

		struct module *owner = disk->fops->owner;



		put_disk(disk);

		module_put(owner);

		disk_put_part(bdev->bd_part);

		bdev->bd_part = NULL;

		bdev->bd_disk = NULL;

		if (bdev != bdev->bd_contains)

			victim = bdev->bd_contains;

		bdev->bd_contains = NULL;



		put_disk(disk);

		module_put(owner);

	}

	mutex_unlock(&bdev->bd_mutex);

	bdput(bdev);

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