On Wed, Jul 15, 2020 at 12:55:18PM +0300, Maxim Levitsky wrote: > Linux kernel only supports logical block sizes which are power of two, > at least 512 bytes and no more that PAGE_SIZE. > > Check this instead of crashing later on. > > Note that there is no need to check physical block size since it is > only a hint, and virtio-blk already only supports power of two values. > > Bugzilla link: https://bugzilla.redhat.com/show_bug.cgi?id=1664619 > > Signed-off-by: Maxim Levitsky <mlevitsk@xxxxxxxxxx> > --- > drivers/block/virtio_blk.c | 20 ++++++++++++++++++-- > 1 file changed, 18 insertions(+), 2 deletions(-) > > diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c > index 980df853ee497..36dda31cc4e96 100644 > --- a/drivers/block/virtio_blk.c > +++ b/drivers/block/virtio_blk.c > @@ -681,6 +681,12 @@ static const struct blk_mq_ops virtio_mq_ops = { > static unsigned int virtblk_queue_depth; > module_param_named(queue_depth, virtblk_queue_depth, uint, 0444); > > + > +static bool virtblk_valid_block_size(unsigned int blksize) > +{ > + return blksize >= 512 && blksize <= PAGE_SIZE && is_power_of_2(blksize); > +} > + Is this a blk core assumption? in that case, does not this belong in blk core? > static int virtblk_probe(struct virtio_device *vdev) > { > struct virtio_blk *vblk; > @@ -809,9 +815,16 @@ 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) { > + if (!virtblk_valid_block_size(blk_size)) { > + dev_err(&vdev->dev, > + "%s failure: unsupported logical block size %d\n", > + __func__, blk_size); > + err = -EINVAL; > + goto out_cleanup_queue; > + } > blk_queue_logical_block_size(q, blk_size); > - else > + } else > blk_size = queue_logical_block_size(q); > > /* Use topology information if available */ OK so if we are doing this pls add {} around blk_size = queue_logical_block_size(q); too. > @@ -872,6 +885,9 @@ static int virtblk_probe(struct virtio_device *vdev) > device_add_disk(&vdev->dev, vblk->disk, virtblk_attr_groups); > return 0; > > +out_cleanup_queue: > + blk_cleanup_queue(vblk->disk->queue); > + vblk->disk->queue = NULL; > out_free_tags: > blk_mq_free_tag_set(&vblk->tag_set); > out_put_disk: > -- > 2.26.2
