Commit 4802b257 authored Jan 02, 2020 by Jacob Pan Committed by Greg Kroah-Hartman Feb 24, 2020

iommu/vt-d: Fix off-by-one in PASID allocation



[ Upstream commit 39d630e332144028f56abba83d94291978e72df1 ]

PASID allocator uses IDR which is exclusive for the end of the
allocation range. There is no need to decrement pasid_max.

Fixes: af395073 ("iommu/vt-d: Apply global PASID in SVA")
Reported-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>

parent 442b50c0

drivers/iommu/intel-svm.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -377,7 +377,7 @@ int intel_svm_bind_mm(struct device dev, int pasid, int flags, struct svm_dev_
		/* Do not use PASID 0 in caching mode (virtualised IOMMU) */
		ret = intel_pasid_alloc_id(svm,
		!!cap_caching_mode(iommu->cap),
		pasid_max - 1, GFP_KERNEL);
		pasid_max, GFP_KERNEL);
		if (ret < 0) {
		kfree(svm);
		kfree(sdev);