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SubjectRe: [PATCH V3 01/10] virtio-blk: validate num_queues during probe
On Tue, Oct 19, 2021 at 03:01:43PM +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 failing the probe in this case.
>Cc: Paolo Bonzini <>
>Cc: Stefan Hajnoczi <>
>Cc: Stefano Garzarella <>
>Signed-off-by: Jason Wang <>
> drivers/block/virtio_blk.c | 4 ++++
> 1 file changed, 4 insertions(+)

Should we CC stable?

Reviewed-by: Stefano Garzarella <>

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