mm: check if PTE is already allocated during page fault

[deliverable/linux.git] / mm / memory.c

diff --git a/mm/memory.c b/mm/memory.c
index b623a249918c95a819e4b3f1b7c0814d24f78a03..607098d47e745b37d375c0aa49d63e5507a9f4b0 100644 (file)
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -3396,7 +3396,7 @@ int handle_mm_fault(struct mm_struct *mm, struct vm_area_struct *vma,
         * run pte_offset_map on the pmd, if an huge pmd could
         * materialize from under us from a different thread.
         */
-       if (unlikely(__pte_alloc(mm, vma, pmd, address)))
+       if (unlikely(pmd_none(*pmd)) && __pte_alloc(mm, vma, pmd, address))
                return VM_FAULT_OOM;
        /* if an huge pmd materialized from under us just retry later */
        if (unlikely(pmd_trans_huge(*pmd)))
@@ -3688,7 +3688,7 @@ static int __access_remote_vm(struct task_struct *tsk, struct mm_struct *mm,
                         */
 #ifdef CONFIG_HAVE_IOREMAP_PROT
                        vma = find_vma(mm, addr);
-                       if (!vma)
+                       if (!vma || vma->vm_start > addr)
                                break;
                        if (vma->vm_ops && vma->vm_ops->access)
                                ret = vma->vm_ops->access(vma, addr, buf,