Commit eebb8034 authored Apr 04, 2016 by Joerg Roedel

iommu: Don't overwrite domain pointer when there is no default_domain



IOMMU drivers that do not support default domains, but make
use of the the group->domain pointer can get that pointer
overwritten with NULL on device add/remove.

Make sure this can't happen by only overwriting the domain
pointer when it is NULL.

Cc: stable@vger.kernel.org # v4.4+
Fixes: 1228236d ('iommu: Move default domain allocation to iommu_group_get_for_dev()')
Signed-off-by: Joerg Roedel <jroedel@suse.de>

parent 07b48ac4

drivers/iommu/iommu.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -848,6 +848,7 @@ struct iommu_group iommu_group_get_for_dev(struct device dev)
		if (!group->default_domain) {
		group->default_domain = __iommu_domain_alloc(dev->bus,
		IOMMU_DOMAIN_DMA);
		if (!group->domain)
		group->domain = group->default_domain;
		}

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