1 files changed, 22 insertions, 1 deletions

diff --git a/fs/namespace.c b/fs/namespace.c
index de402eb6eafb..a72eaabfe8f2 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -1484,13 +1484,30 @@ out_unlock:
 }
 
 /*
+ * Sanity check the flags to change_mnt_propagation.
+ */
+
+static int flags_to_propagation_type(int flags)
+{
+        int type = flags & ~MS_REC;
+
+        /* Fail if any non-propagation flags are set */
+        if (type & ~(MS_SHARED | MS_PRIVATE | MS_SLAVE | MS_UNBINDABLE))
+                return 0;
+        /* Only one propagation flag should be set */
+        if (!is_power_of_2(type))
+                return 0;
+        return type;
+}
+
+/*
  * recursively change the type of the mountpoint.
  */
 static int do_change_type(struct path *path, int flag)
 {
         struct vfsmount *m, *mnt = path->mnt;
         int recurse = flag & MS_REC;
-        int type = flag & ~MS_REC;
+        int type;
         int err = 0;
 
         if (!capable(CAP_SYS_ADMIN))
@@ -1499,6 +1516,10 @@ static int do_change_type(struct path *path, int flag)
         if (path->dentry != path->mnt->mnt_root)
                 return -EINVAL;
 
+        type = flags_to_propagation_type(flag);
+        if (!type)
+                return -EINVAL;
+
         down_write(&namespace_sem);
         if (type == MS_SHARED) {
                 err = invent_group_ids(mnt, recurse);