[PATCH V3 01/10] virtio-blk: validate num_queues during probe
From: Jason Wang <jasowang@redhat.com>
Date: 2021-10-19 07:02:53
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lkml
Subsystem:
block layer, the rest, virtio block and scsi drivers, virtio core · Maintainers:
Jens Axboe, Linus Torvalds, "Michael S. Tsirkin", Jason Wang
If an untrusted device neogitates BLK_F_MQ but advertises a zero num_queues, the driver may end up trying to allocating zero size buffers where ZERO_SIZE_PTR is returned which may pass the checking against the NULL. This will lead unexpected results. Fixing this by failing the probe in this case. Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Stefan Hajnoczi <stefanha@redhat.com> Cc: Stefano Garzarella <sgarzare@redhat.com> Signed-off-by: Jason Wang <jasowang@redhat.com> --- drivers/block/virtio_blk.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
index 9b3bd083b411..10bc0879e618 100644
--- a/drivers/block/virtio_blk.c
+++ b/drivers/block/virtio_blk.c@@ -497,6 +497,10 @@ static int init_vq(struct virtio_blk *vblk) &num_vqs); if (err) num_vqs = 1; + if (!err && !num_vqs) { + dev_err(&vdev->dev, "MQ advertisted but zero queues reported\n"); + return -EINVAL; + } num_vqs = min_t(unsigned int, nr_cpu_ids, num_vqs);
--
2.25.1
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