[PATCH 5.9 306/391] ubifs: Fix a memleak after dumping authentication mount options

[Greg Kroah-Hartman]

From: Zhihao Cheng <chengzhih...@huawei.com>

commit 47f6d9ce45b03a40c34b668a9884754c58122b39 upstream.

Fix a memory leak after dumping authentication mount options in error
handling branch.

Signed-off-by: Zhihao Cheng <chengzhih...@huawei.com>
Cc: <sta...@vger.kernel.org>  # 4.20+
Fixes: d8a22773a12c6d7 ("ubifs: Enable authentication support")
Reviewed-by: Sascha Hauer <s.ha...@pengutronix.de>
Signed-off-by: Richard Weinberger <rich...@nod.at>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 fs/ubifs/super.c |   16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

--- a/fs/ubifs/super.c
+++ b/fs/ubifs/super.c
@@ -1141,6 +1141,18 @@ static int ubifs_parse_options(struct ub
        return 0;
 }
 
+/*
+ * ubifs_release_options - release mount parameters which have been dumped.
+ * @c: UBIFS file-system description object
+ */
+static void ubifs_release_options(struct ubifs_info *c)
+{
+       kfree(c->auth_key_name);
+       c->auth_key_name = NULL;
+       kfree(c->auth_hash_name);
+       c->auth_hash_name = NULL;
+}
+
 /**
  * destroy_journal - destroy journal data structures.
  * @c: UBIFS file-system description object
@@ -1650,8 +1662,7 @@ static void ubifs_umount(struct ubifs_in
        ubifs_lpt_free(c, 0);
        ubifs_exit_authentication(c);
 
-       kfree(c->auth_key_name);
-       kfree(c->auth_hash_name);
+       ubifs_release_options(c);
        kfree(c->cbuf);
        kfree(c->rcvrd_mst_node);
        kfree(c->mst_node);
@@ -2219,6 +2230,7 @@ out_umount:
 out_unlock:
        mutex_unlock(&c->umount_mutex);
 out_close:
+       ubifs_release_options(c);
        ubi_close_volume(c->ubi);
 out:
        return err;