Prevent oops at boot with VT-d
With some broken BIOSs when VT-d is enabled, the data structures are
filled incorrectly. This can cause a NULL pointer dereference in very
early boot.
Signed-off-by: Dirk Hohndel <hohndel@linux.intel.com>
Acked-by: Yu Zhao <yu.zhao@intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c
index 235fb7a..3dfecb2 100644
--- a/drivers/pci/intel-iommu.c
+++ b/drivers/pci/intel-iommu.c
@@ -438,7 +438,8 @@
continue;
for (i = 0; i < drhd->devices_cnt; i++)
- if (drhd->devices[i]->bus->number == bus &&
+ if (drhd->devices[i] &&
+ drhd->devices[i]->bus->number == bus &&
drhd->devices[i]->devfn == devfn)
return drhd->iommu;
