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

From: Eric Auger
Date: Mon Jul 22 2019 - 10:55:21 EST

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(-)