From 288e4877f94a3b144aadc206e7796921d02432c1 Mon Sep 17 00:00:00 2001 From: Dirk Hohndel Date: Sun, 11 Jan 2009 15:33:51 +0000 Subject: [PATCH] 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 Acked-by: Yu Zhao Signed-off-by: David Woodhouse Signed-off-by: Linus Torvalds --- drivers/pci/intel-iommu.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c index 235fb7a5a8a5..3dfecb20d5e7 100644 --- 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; -- 2.34.1