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iommupt: Return zero for invalid iova_to_phys() ranges

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DOMAIN_NS(iova_to_phys) returns a phys_addr_t and follows the IOMMU
iova_to_phys() convention of returning 0 when there is no valid
translation.

make_range() returns a negative errno if the input IOVA cannot be
represented by this page table format. Returning that errno directly
casts it to phys_addr_t. Callers treat zero as no translation and use
non-zero values as physical addresses, so this can make them consume a
bogus physical address instead of seeing a failed translation.

Match the page-table walk failure path and return 0 for range validation
failures too.

Fixes: 9d4c274cd7 ("iommupt: Add iova_to_phys op")
Cc: stable@vger.kernel.org
Assisted-by: Qoder:Qwen-3.8-MAX-Preview
Signed-off-by: Shuai Xue <xueshuai@linux.alibaba.com>
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Shuai Xue
2026-07-26 15:43:32 +08:00
committed by Joerg Roedel
parent 4ac2ce1238
commit 41cdc2a3d4
1 changed files with 1 additions and 1 deletions
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2
drivers/iommu/generic_pt/iommu_pt.h
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@@ -224,7 +224,7 @@ phys_addr_t DOMAIN_NS(iova_to_phys)(struct iommu_domain *domain,
ret = make_range(common_from_iommu(iommu_table), &range, iova, 1);
if (ret)
return ret;
return 0;
ret = pt_walk_range(&range, __iova_to_phys, &res);
/* PHYS_ADDR_MAX would be a better error code */