NTFS: Fix handling of valid but empty mapping pairs array in

      fs/ntfs/runlist.c::ntfs_mapping_pairs_decompress().

Signed-off-by: Anton Altaparmakov <aia21@cantab.net>

1 files changed, 3 insertions, 0 deletions

diff --git a/fs/ntfs/runlist.c b/fs/ntfs/runlist.c
index d26a1be530c..e4c4716939d 100644
--- a/fs/ntfs/runlist.c
+++ b/fs/ntfs/runlist.c
@@ -760,6 +760,9 @@ runlist_element *ntfs_mapping_pairs_decompress(const ntfs_volume *vol,
                 ntfs_error(vol->sb, "Corrupt attribute.");
                 return ERR_PTR(-EIO);
         }
+        /* If the mapping pairs array is valid but empty, nothing to do. */
+        if (!vcn && !*buf)
+                return old_rl;
         /* Current position in runlist array. */
         rlpos = 0;
         /* Allocate first page and set current runlist size to one page. */