drm/ttm: Fix accesses through vmas with only partial coverage

VMAs covering a bo but that didn't start at the same address space offset as
the bo they were mapping were incorrectly generating SEGFAULT errors in
the fault handler.

Reported-by: Joseph Dolinak <kanilo2@yahoo.com>
Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Jakob Bornecrantz <jakob@vmware.com>
Cc: stable@vger.kernel.org

diff --git a/drivers/gpu/drm/ttm/ttm_bo_vm.c b/drivers/gpu/drm/ttm/ttm_bo_vm.c
index b249ab9b1eb29c402d407049a42c2fda83b3ffb1..6440eeac22d250844d2203018258654e54483cd3 100644 (file)
--- a/drivers/gpu/drm/ttm/ttm_bo_vm.c
+++ b/drivers/gpu/drm/ttm/ttm_bo_vm.c
@@ -169,9 +169,9 @@ static int ttm_bo_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
        }
 
        page_offset = ((address - vma->vm_start) >> PAGE_SHIFT) +
-           drm_vma_node_start(&bo->vma_node) - vma->vm_pgoff;
-       page_last = vma_pages(vma) +
-           drm_vma_node_start(&bo->vma_node) - vma->vm_pgoff;
+               vma->vm_pgoff - drm_vma_node_start(&bo->vma_node);
+       page_last = vma_pages(vma) + vma->vm_pgoff -
+               drm_vma_node_start(&bo->vma_node);
 
        if (unlikely(page_offset >= bo->num_pages)) {
                retval = VM_FAULT_SIGBUS;