diff options
Diffstat (limited to 'drivers/iommu/dmar.c')
| -rw-r--r-- | drivers/iommu/dmar.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c index 56e1c79dc77f..e531a2b07207 100644 --- a/drivers/iommu/dmar.c +++ b/drivers/iommu/dmar.c @@ -657,7 +657,12 @@ static void __init dmar_acpi_insert_dev_scope(u8 device_number, static int __init dmar_acpi_dev_scope_init(void) { - struct acpi_dmar_andd *andd = (void *)dmar_tbl + sizeof(struct acpi_table_dmar); + struct acpi_dmar_andd *andd; + + if (dmar_tbl == NULL) + return -ENODEV; + + andd = (void *)dmar_tbl + sizeof(struct acpi_table_dmar); while (((unsigned long)andd) < ((unsigned long)dmar_tbl) + dmar_tbl->length) { |