Merge tag 'drm-misc-fixes-2017-08-18' of git://anongit.freedesktop.org/git/drm-misc...

[karo-tx-linux.git] / mm / userfaultfd.c

diff --git a/mm/userfaultfd.c b/mm/userfaultfd.c
index 479e631d43c2f609466b1dee97ca2d0314ae12ba..8bcb501bce60b84f8bbc3c79cb2790bae2daa86a 100644 (file)
--- a/mm/userfaultfd.c
+++ b/mm/userfaultfd.c
@@ -128,19 +128,22 @@ out_unlock:
 static pmd_t *mm_alloc_pmd(struct mm_struct *mm, unsigned long address)
 {
        pgd_t *pgd;
+       p4d_t *p4d;
        pud_t *pud;
-       pmd_t *pmd = NULL;
 
        pgd = pgd_offset(mm, address);
-       pud = pud_alloc(mm, pgd, address);
-       if (pud)
-               /*
-                * Note that we didn't run this because the pmd was
-                * missing, the *pmd may be already established and in
-                * turn it may also be a trans_huge_pmd.
-                */
-               pmd = pmd_alloc(mm, pud, address);
-       return pmd;
+       p4d = p4d_alloc(mm, pgd, address);
+       if (!p4d)
+               return NULL;
+       pud = pud_alloc(mm, p4d, address);
+       if (!pud)
+               return NULL;
+       /*
+        * Note that we didn't run this because the pmd was
+        * missing, the *pmd may be already established and in
+        * turn it may also be a trans_huge_pmd.
+        */
+       return pmd_alloc(mm, pud, address);
 }
 
 #ifdef CONFIG_HUGETLB_PAGE