tree 5fc2bb026d76a0e2bec7a595f9d0e973383bdb2a
parent 1bc9e65f2e71f71d3353e7adf97931e08277dd8d
author Ming Lei <ming.lei@redhat.com> 1608525215 +0800
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1610888275 +0100

block: fix use-after-free in disk_part_iter_next

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>