1 files changed, 32 insertions, 18 deletions

diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 643f66e10187..8034abd3a135 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -806,9 +806,13 @@ static long do_get_mempolicy(int *policy, nodemask_t *nmask,
 
         err = 0;
         if (nmask) {
-                task_lock(current);
-                get_policy_nodemask(pol, nmask);
-                task_unlock(current);
+                if (mpol_store_user_nodemask(pol)) {
+                        *nmask = pol->w.user_nodemask;
+                } else {
+                        task_lock(current);
+                        get_policy_nodemask(pol, nmask);
+                        task_unlock(current);
+                }
         }
 
  out:
@@ -2195,8 +2199,8 @@ int mpol_parse_str(char *str, struct mempolicy **mpol, int no_context)
                         char *rest = nodelist;
                         while (isdigit(*rest))
                                 rest++;
-                        if (!*rest)
-                                err = 0;
+                        if (*rest)
+                                goto out;
                 }
                 break;
         case MPOL_INTERLEAVE:
@@ -2205,7 +2209,6 @@ int mpol_parse_str(char *str, struct mempolicy **mpol, int no_context)
                  */
                 if (!nodelist)
                         nodes = node_states[N_HIGH_MEMORY];
-                err = 0;
                 break;
         case MPOL_LOCAL:
                 /*
@@ -2215,11 +2218,19 @@ int mpol_parse_str(char *str, struct mempolicy **mpol, int no_context)
                         goto out;
                 mode = MPOL_PREFERRED;
                 break;
-
-        /*
-         * case MPOL_BIND:    mpol_new() enforces non-empty nodemask.
-         * case MPOL_DEFAULT: mpol_new() enforces empty nodemask, ignores flags.
-         */
+        case MPOL_DEFAULT:
+                /*
+                 * Insist on a empty nodelist
+                 */
+                if (!nodelist)
+                        err = 0;
+                goto out;
+        case MPOL_BIND:
+                /*
+                 * Insist on a nodelist
+                 */
+                if (!nodelist)
+                        goto out;
         }
 
         mode_flags = 0;
@@ -2233,13 +2244,14 @@ int mpol_parse_str(char *str, struct mempolicy **mpol, int no_context)
                 else if (!strcmp(flags, "relative"))
                         mode_flags |= MPOL_F_RELATIVE_NODES;
                 else
-                        err = 1;
+                        goto out;
         }
 
         new = mpol_new(mode, mode_flags, &nodes);
         if (IS_ERR(new))
-                err = 1;
-        else {
+                goto out;
+
+        {
                 int ret;
                 NODEMASK_SCRATCH(scratch);
                 if (scratch) {
@@ -2250,13 +2262,15 @@ int mpol_parse_str(char *str, struct mempolicy **mpol, int no_context)
                         ret = -ENOMEM;
                 NODEMASK_SCRATCH_FREE(scratch);
                 if (ret) {
-                        err = 1;
                         mpol_put(new);
-                } else if (no_context) {
-                        /* save for contextualization */
-                        new->w.user_nodemask = nodes;
+                        goto out;
                 }
         }
+        err = 0;
+        if (no_context) {
+                /* save for contextualization */
+                new->w.user_nodemask = nodes;
+        }
 
 out:
         /* Restore string for error message */