Re: [PATCH 1/9] virtio-blk: validate num_queues during probe

[Stefan Hajnoczi]

On Mon, Sep 13, 2021 at 01:53:45PM +0800, Jason Wang wrote:
> 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 using single queue if num_queues is zero.
> 
> Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx>
> Cc: Stefan Hajnoczi <stefanha@xxxxxxxxxx>
> Signed-off-by: Jason Wang <jasowang@xxxxxxxxxx>
> ---
>  drivers/block/virtio_blk.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)

Reviewed-by: Stefan Hajnoczi <stefanha@xxxxxxxxxx>

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