CVE-2025-39699 — iommu/riscv: prevent NULL deref in iova_to_phys

Affected: Linux

In the Linux kernel, the following vulnerability has been resolved:

iommu/riscv: prevent NULL deref in iova_to_phys

The riscv_iommu_pte_fetch() function returns either NULL for unmapped/never-mapped iova, or a valid leaf pte pointer that requires no further validation.

riscv_iommu_iova_to_phys() failed to handle NULL returns. Prevent null pointer dereference in riscv_iommu_iova_to_phys(), and remove the pte validation.

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CVE-2025-39699 — iommu/riscv: prevent NULL deref in iova_to_phys