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iommu/vt-d: Fix NULL pointer reference in intel_svm_bind_mm() 

Intel IOMMU could be turned off with intel_iommu=off. If Intel
IOMMU is off,  the intel_iommu struct will not be initialized.
When device drivers call intel_svm_bind_mm(), the NULL pointer
reference will happen there.

Add dmar_disabled check to avoid NULL pointer reference.

Cc: Ashok Raj <ashok.raj@intel.com>
Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>
Reported-by: Dave Jiang <dave.jiang@intel.com>
Fixes: 2f26e0a9c9 ("iommu/vt-d: Add basic SVM PASID support")
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Lu Baolu 2019-03-01 11:23:12 +08:00 committed by Joerg Roedel
parent 41b80db227
commit c56cba5daf
1 changed files with 1 additions and 1 deletions
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2
drivers/iommu/intel-svm.c
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@ -234,7 +234,7 @@ int intel_svm_bind_mm(struct device *dev, int *pasid, int flags, struct svm_dev_
int pasid_max;
int ret;
if (!iommu)
if (!iommu || dmar_disabled)
return -EINVAL;
if (dev_is_pci(dev)) {