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 <[email protected]> Acked-by: Yu Zhao <[email protected]> Signed-off-by: David Woodhouse <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
josf · Jan 13, 2009 · 288e487 · 288e487
1 parent 37a76bd
commit 288e487
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c
@@ -438,7 +438,8 @@ static struct intel_iommu *device_to_iommu(u8 bus, u8 devfn)
 			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;