On Tue, Jun 15, 2021 at 06:48:10PM +0800, Xie Yongji wrote: > This ensures that we will not use an invalid block size > in config space (might come from an untrusted device). > > Signed-off-by: Xie Yongji <xieyongji@xxxxxxxxxxxxx> I'd say if device presents an unreasonable value, and we want to ignore that, then we should not negotiate VIRTIO_BLK_F_BLK_SIZE so that host knows. So maybe move the logic to validate_features. > --- > drivers/block/virtio_blk.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c > index b9fa3ef5b57c..85ae3b27ea4b 100644 > --- a/drivers/block/virtio_blk.c > +++ b/drivers/block/virtio_blk.c > @@ -827,7 +827,7 @@ static int virtblk_probe(struct virtio_device *vdev) > err = virtio_cread_feature(vdev, VIRTIO_BLK_F_BLK_SIZE, > struct virtio_blk_config, blk_size, > &blk_size); > - if (!err) > + if (!err && blk_size >= SECTOR_SIZE && blk_size <= PAGE_SIZE) > blk_queue_logical_block_size(q, blk_size); > else > blk_size = queue_logical_block_size(q); > -- > 2.11.0
