[PATCH 24/61] SPARC64: Fix memory corruption in pci_4u_free_consistent().

[Chris Wright]

-stable review patch.  If anyone has any objections, please let us know.
------------------

From: David Miller <davem@xxxxxxxxxxxxx>

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@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>
Signed-off-by: Chris Wright <chrisw@xxxxxxxxxxxx>

---
 arch/sparc64/kernel/pci_iommu.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- linux-2.6.18.1.orig/arch/sparc64/kernel/pci_iommu.c
+++ linux-2.6.18.1/arch/sparc64/kernel/pci_iommu.c
@@ -281,7 +281,7 @@ static void pci_4u_free_consistent(struc
 
 	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);
 

--
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