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-rw-r--r--mm/memory.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/mm/memory.c b/mm/memory.c
index bbab1e37..48c122d4 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -969,7 +969,7 @@ struct page *follow_page(struct vm_area_struct *vma, unsigned long address,
goto no_page_table;
pmd = pmd_offset(pud, address);
- if (pmd_none(*pmd) || unlikely(pmd_bad(*pmd)))
+ if (pmd_none(*pmd))
goto no_page_table;
if (pmd_huge(*pmd)) {
@@ -978,6 +978,9 @@ struct page *follow_page(struct vm_area_struct *vma, unsigned long address,
goto out;
}
+ if (unlikely(pmd_bad(*pmd)))
+ goto no_page_table;
+
ptep = pte_offset_map_lock(mm, pmd, address, &ptl);
if (!ptep)
goto out;
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