[PATCH] add vma->ops check before do_nonlinear_fault()

[Boll Liu <bollliu@gmail.com>]

Function do_nonlinear_fault() will also call vma->vm_ops->fault().
So add vma->ops and vma->vm_ops->fault check the same as before
calling do_nonlinear_fault().

Signed-off-by: Boll Liu <BollLiu@gmail.com>
---
 mm/memory.c |   10 +++++++---
 1 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/mm/memory.c b/mm/memory.c
index aede2ce..86ebdd6 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -2921,9 +2921,13 @@ static inline int handle_pte_fault(struct mm_struct *mm,
 			return do_anonymous_page(mm, vma, address,
 						 pte, pmd, flags);
 		}
-		if (pte_file(entry))
-			return do_nonlinear_fault(mm, vma, address,
-					pte, pmd, flags, entry);
+		if (pte_file(entry)) {
+			if (vma->vm_ops) {
+				if (likely(vma->vm_ops->fault))
+					return do_nonlinear_fault(mm, vma, address,
+						pte, pmd, flags, entry);
+			}
+		}
 		return do_swap_page(mm, vma, address,
 					pte, pmd, flags, entry);
 	}
-- 
1.5.6.3

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