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Subject[PATCH 24/61] SPARC64: Fix memory corruption in pci_4u_free_consistent().
-stable review patch.  If anyone has any objections, please let us know.
------------------

From: David Miller <davem@davemloft.net>

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>

---
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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