[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
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  • Fix NULL pointer dereference with virtio-blk-pci and virtual IOMMU
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Auger Eric July 22, 2019, 2:55 p.m. UTC
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(-)