UBIFS: fix a rare memory leak in ro to rw remounting path

commit eaeee242c531cd4b0a4a46e8b5dd7ef504380c42 upstream.

When re-mounting from R/O mode to R/W mode and the LEB count in the superblock
is not up-to date, because for the underlying UBI volume became larger, we
re-write the superblock. We allocate RAM for these purposes, but never free it.
So this is a memory leak, although very rare one.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/fs/ubifs/sb.c b/fs/ubifs/sb.c
index 57085e43320fdaf1925fd293f999978e8373077c..238ad158340f524772c163705fdd7171b48b19ac 100644 (file)
--- a/fs/ubifs/sb.c
+++ b/fs/ubifs/sb.c
@@ -474,7 +474,8 @@ failed:
  * @c: UBIFS file-system description object
  *
  * This function returns a pointer to the superblock node or a negative error
- * code.
+ * code. Note, the user of this function is responsible of kfree()'ing the
+ * returned superblock buffer.
  */
 struct ubifs_sb_node *ubifs_read_sb_node(struct ubifs_info *c)
 {

diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c
index 43f9d19a6f3313ec3df7f358138e153703d4895b..4ccc5d9a51fee7de67aff62c6f0f935039e266f9 100644 (file)
--- a/fs/ubifs/super.c
+++ b/fs/ubifs/super.c
@@ -1545,6 +1545,7 @@ static int ubifs_remount_rw(struct ubifs_info *c)
                }
                sup->leb_cnt = cpu_to_le32(c->leb_cnt);
                err = ubifs_write_sb_node(c, sup);
+               kfree(sup);
                if (err)
                        goto out;
        }