1 files changed, 11 insertions, 1 deletions

diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 1763418f1ad..3d64b369180 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -1552,8 +1552,18 @@ struct mempolicy *get_vma_policy(struct task_struct *task,
                                                                         addr);
                         if (vpol)
                                 pol = vpol;
-                } else if (vma->vm_policy)
+                } else if (vma->vm_policy) {
                         pol = vma->vm_policy;
+
+                        /*
+                         * shmem_alloc_page() passes MPOL_F_SHARED policy with
+                         * a pseudo vma whose vma->vm_ops=NULL. Take a reference
+                         * count on these policies which will be dropped by
+                         * mpol_cond_put() later
+                         */
+                        if (mpol_needs_cond_ref(pol))
+                                mpol_get(pol);
+                }
         }
         if (!pol)
                 pol = &default_policy;