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

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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
This commit is contained in:
Thomas Hellstrom 2013-12-08 23:23:57 -08:00
parent 9255ce80f8
commit d386735588
1 changed files with 3 additions and 3 deletions
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6
drivers/gpu/drm/ttm/ttm_bo_vm.c
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@ -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;