From 11b93ebfa03e1cf45d9ad508eaf2c4d3547e06ca Mon Sep 17 00:00:00 2001 From: Ashok Raj Date: Tue, 8 Aug 2017 13:29:28 -0700 Subject: iommu/vt-d: Avoid calling virt_to_phys() on null pointer New kernels with debug show panic() from __phys_addr() checks. Avoid calling virt_to_phys() when pasid_state_tbl pointer is null To: Joerg Roedel To: linux-kernel@vger.kernel.org> Cc: iommu@lists.linux-foundation.org Cc: David Woodhouse Cc: Jacob Pan Cc: Ashok Raj Fixes: 2f26e0a9c9860 ('iommu/vt-d: Add basic SVM PASID support') Signed-off-by: Ashok Raj Acked-by: David Woodhouse Signed-off-by: Joerg Roedel --- drivers/iommu/intel-iommu.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'drivers/iommu/intel-iommu.c') diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c index bffc880f3fef..695f54ad07cc 100644 --- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -5349,7 +5349,8 @@ int intel_iommu_enable_pasid(struct intel_iommu *iommu, struct intel_svm_dev *sd sdev->sid = PCI_DEVID(info->bus, info->devfn); if (!(ctx_lo & CONTEXT_PASIDE)) { - context[1].hi = (u64)virt_to_phys(iommu->pasid_state_table); + if (iommu->pasid_state_table) + context[1].hi = (u64)virt_to_phys(iommu->pasid_state_table); context[1].lo = (u64)virt_to_phys(iommu->pasid_table) | intel_iommu_get_pts(iommu); -- cgit v1.2.3