From: Nick Piggin <npiggin@suse.de>

Paper bag time.  Thanks to Randy for noticing that I didn't actually assign
'present' to anything.

Unfortunately my original patch passed the few simple test cases I gave it,
purely by coincidence.

Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/mincore.c |    5 +++++
 1 file changed, 5 insertions(+)

diff -puN mm/mincore.c~mincore-fill-in-results-properly mm/mincore.c
--- a/mm/mincore.c~mincore-fill-in-results-properly
+++ a/mm/mincore.c
@@ -125,6 +125,8 @@ static long do_mincore(unsigned long add
 #endif
 			}
 		}
+
+		vec[i] = present;
 	}
 	pte_unmap_unlock(ptep-1, ptl);
 
@@ -135,6 +137,9 @@ none_mapped:
 		pgoff = linear_page_index(vma, addr);
 		for (i = 0; i < nr; i++, pgoff++)
 			vec[i] = mincore_page(vma->vm_file->f_mapping, pgoff);
+	} else {
+		for (i = 0; i < nr; i++)
+			vec[i] = 0;
 	}
 
 	return nr;
_