[PATCH 5.4 60/62] block: fix use-after-free in disk_part_iter_next

Greg Kroah-Hartman
2021-01-15T12:50:46Z

From: Ming Lei <ming.lei@redhat.com>

commit aebf5db917055b38f4945ed6d621d9f07a44ff30 upstream.

Make sure that bdgrab() is done on the 'block_device' instance before
referring to it for avoiding use-after-free.

Cc: <stable@vger.kernel.org>
Reported-by: syzbot+825f0f9657d4e528046e@syzkaller.appspotmail.com
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
block/genhd.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)

--- a/block/genhd.c
+++ b/block/genhd.c
@@ -222,14 +222,17 @@ struct hd_struct *disk_part_iter_next(st
part = rcu_dereference(ptbl->part[piter->idx]);
if (!part)
continue;
+ get_device(part_to_dev(part));
+ piter->part = part;
if (!part_nr_sects_read(part) &&
!(piter->flags & DISK_PITER_INCL_EMPTY) &&
!(piter->flags & DISK_PITER_INCL_EMPTY_PART0 &&
- piter->idx == 0))
+ piter->idx == 0)) {
+ put_device(part_to_dev(part));
+ piter->part = NULL;
continue;
+ }

- get_device(part_to_dev(part));
- piter->part = part;
piter->idx += inc;
break;
}