linux-kernel - Re: [PATCH 2/2] virtio/virtio_ring: Fix the dma_max_mapping

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Message-ID: <20190722152710.GB3780@lst.de>
Date:   Mon, 22 Jul 2019 17:27:10 +0200
From:   Christoph Hellwig <hch@....de>
To:     Eric Auger <eric.auger@...hat.com>
Cc:     eric.auger.pro@...il.com, hch@....de, m.szyprowski@...sung.com,
        robin.murphy@....com, mst@...hat.com, jasowang@...hat.com,
        virtualization@...ts.linux-foundation.org,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] virtio/virtio_ring: Fix the dma_max_mapping_size
 call

On Mon, Jul 22, 2019 at 04:55:09PM +0200, Eric Auger wrote:
> Do not call dma_max_mapping_size for devices that have no DMA
> mask set, otherwise we can hit a NULL pointer dereference.
> 
> This occurs when a virtio-blk-pci device is protected with
> a virtual IOMMU.
> 
> Fixes: e6d6dd6c875e ("virtio: Introduce virtio_max_dma_size()")
> Signed-off-by: Eric Auger <eric.auger@...hat.com>
> Suggested-by: Christoph Hellwig <hch@....de>

Looks good.  virtio maintainers, let me know if you want to queue
it up or if I should pick the patch up through the dma-mapping tree.