1 files changed, 8 insertions, 1 deletions

diff --git a/arch/x86/kernel/pci-gart_64.c b/arch/x86/kernel/pci-gart_64.c
index 82ada01625b9..b117efd24f71 100644
--- a/arch/x86/kernel/pci-gart_64.c
+++ b/arch/x86/kernel/pci-gart_64.c
@@ -81,6 +81,9 @@ static u32 gart_unmapped_entry;
 #define AGPEXTERN
 #endif
 
+/* GART can only remap to physical addresses < 1TB */
+#define GART_MAX_PHYS_ADDR      (1ULL << 40)
+
 /* backdoor interface to AGP driver */
 AGPEXTERN int agp_memory_reserved;
 AGPEXTERN __u32 *agp_gatt_table;
@@ -212,9 +215,13 @@ static dma_addr_t dma_map_area(struct device *dev, dma_addr_t phys_mem,
                                 size_t size, int dir, unsigned long align_mask)
 {
         unsigned long npages = iommu_num_pages(phys_mem, size, PAGE_SIZE);
-        unsigned long iommu_page = alloc_iommu(dev, npages, align_mask);
+        unsigned long iommu_page;
         int i;
 
+        if (unlikely(phys_mem + size > GART_MAX_PHYS_ADDR))
+                return bad_dma_addr;
+
+        iommu_page = alloc_iommu(dev, npages, align_mask);
         if (iommu_page == -1) {
                 if (!nonforced_iommu(dev, phys_mem, size))
                         return phys_mem;