UBIFS: fix double free of ubifs_orphan objects

The last orphan in the dnext list has its dnext set to NULL. Because
of that, ubifs_delete_orphan assumes that it is not on the dnext list
and frees it immediately instead ignoring it as a second delete. The
orphan is later freed again by erase_deleted.

This change adds an explicit flag to ubifs_orphan indicating whether
it is pending delete.

Signed-off-by: Adam Thomas <adamthomas1111@gmail.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Cc: stable@vger.kernel.org

1 files changed, 2 insertions, 0 deletions

diff --git a/fs/ubifs/ubifs.h b/fs/ubifs/ubifs.h
index c16fff7271d3..b2babce4d70f 100644
--- a/fs/ubifs/ubifs.h
+++ b/fs/ubifs/ubifs.h
@@ -905,6 +905,7 @@ struct ubifs_budget_req {
  * @inum: inode number
  * @new: %1 => added since the last commit, otherwise %0
  * @cmt: %1 => commit pending, otherwise %0
+ * @del: %1 => delete pending, otherwise %0
  */
 struct ubifs_orphan {
         struct rb_node rb;
@@ -915,6 +916,7 @@ struct ubifs_orphan {
         ino_t inum;
         unsigned new:1;
         unsigned cmt:1;
+        unsigned del:1;
 };
 
 /**