mm: fix ENOSPC returned by handle_mm_fault()

Al Viro observes that in the hugetlb case, handle_mm_fault() may return
a value of the kind ENOSPC when its caller is expecting a value of the
kind VM_FAULT_SIGBUS: fix alloc_huge_page()'s failure returns.

Signed-off-by: Hugh Dickins <hughd@google.com>
Acked-by: Al Viro <viro@zeniv.linux.org.uk>
Cc: stable@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index f33bb319b73f..6402458fee38 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -1033,10 +1033,10 @@ static struct page *alloc_huge_page(struct vm_area_struct *vma,
          */
         chg = vma_needs_reservation(h, vma, addr);
         if (chg < 0)
-                return ERR_PTR(chg);
+                return ERR_PTR(-VM_FAULT_OOM);
         if (chg)
                 if (hugetlb_get_quota(inode->i_mapping, chg))
-                        return ERR_PTR(-ENOSPC);
+                        return ERR_PTR(-VM_FAULT_SIGBUS);
 
         spin_lock(&hugetlb_lock);
         page = dequeue_huge_page_vma(h, vma, addr, avoid_reserve);