tree 18886a2d7dd7756ae1b46009092d4003a5faa09d
parent cf04eee8bf0e842dd73a64d02cdcdcbb31b0102c
author Joerg Roedel <joro@8bytes.org> 1395775000 +0100
committer Joerg Roedel <joro@8bytes.org> 1395776169 +0100

iommu/vt-d: Check for NULL pointer in dmar_acpi_dev_scope_init()

When ir_dev_scope_init() is called via a rootfs initcall it
will check for irq_remapping_enabled before it calls
(indirectly) into dmar_acpi_dev_scope_init() which uses the
dmar_tbl pointer without any checks.

The AMD IOMMU driver also sets the irq_remapping_enabled
flag which causes the dmar_acpi_dev_scope_init() function to
be called on systems with AMD IOMMU hardware too, causing a
boot-time kernel crash.

Signed-off-by: Joerg Roedel <joro@8bytes.org>