linux-kernel - Re: [PATCH 1/9] virtio-blk: validate num

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Message-ID: <YT8+bhzt5uy3PBzD@stefanha-x1.localdomain>
Date:   Mon, 13 Sep 2021 13:05:02 +0100
From:   Stefan Hajnoczi <stefanha@...hat.com>
To:     Jason Wang <jasowang@...hat.com>
Cc:     mst@...hat.com, virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, f.hetzelt@...berlin.de,
        david.kaplan@....com, konrad.wilk@...cle.com,
        Paolo Bonzini <pbonzini@...hat.com>
Subject: Re: [PATCH 1/9] virtio-blk: validate num_queues during probe

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@...hat.com>
> Cc: Stefan Hajnoczi <stefanha@...hat.com>
> Signed-off-by: Jason Wang <jasowang@...hat.com>
> ---
>  drivers/block/virtio_blk.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)

Reviewed-by: Stefan Hajnoczi <stefanha@...hat.com>

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