[SPARC64]: Fix memory corruption in pci_4u_free_consistent().



The second argument to free_npages() was being incorrectly
calculated, which would thus access far past the end of the
arena->map[] bitmap.

Signed-off-by: David S. Miller <davem@davemloft.net>

parent 4130a4b2

arch/sparc64/kernel/pci_iommu.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -281,7 +281,7 @@ static void pci_4u_free_consistent(struct pci_dev pdev, size_t size, void cpu,

		spin_lock_irqsave(&iommu->lock, flags);

		free_npages(iommu, dvma, npages);
		free_npages(iommu, dvma - iommu->page_table_map_base, npages);

		spin_unlock_irqrestore(&iommu->lock, flags);