linux-kernel - [PATCH 0/2] Fix NULL pointer dereference with virtio-blk-pci and virtual IOMMU

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Message-Id: <20190722145509.1284-1-eric.auger@redhat.com>
Date:   Mon, 22 Jul 2019 16:55:07 +0200
From:   Eric Auger <eric.auger@...hat.com>
To:     eric.auger.pro@...il.com, eric.auger@...hat.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: [PATCH 0/2] Fix NULL pointer dereference with virtio-blk-pci and virtual IOMMU

When running a guest featuring a virtio-blk-pci protected with a virtual
IOMMU we hit a NULL pointer dereference.

This series removes the dma_max_mapping_size() call in
virtio_max_dma_size when the device does not have any dma_mask set.
A check is also added to early return in dma_addressing_limited()
if the dma_mask is NULL.

Eric Auger (2):
  dma-mapping: Protect dma_addressing_limited against NULL dma_mask
  virtio/virtio_ring: Fix the dma_max_mapping_size call

 drivers/virtio/virtio_ring.c | 2 +-
 include/linux/dma-mapping.h  | 5 +++--
 2 files changed, 4 insertions(+), 3 deletions(-)

-- 
2.20.1