linux-kernel - [PATCH] [24/99] UBIFS: fix a rare memory leak in ro to rw remounting path

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Message-Id: <20110727214822.BAD082403FF@tassilo.jf.intel.com>
Date:	Wed, 27 Jul 2011 14:48:22 -0700 (PDT)
From:	Andi Kleen <andi@...stfloor.org>
To:	Artem.Bityutskiy@...ia.com, gregkh@...e.de, ak@...ux.intel.com,
	linux-kernel@...r.kernel.org, stable@...nel.org,
	tim.bird@...sony.com
Subject: [PATCH] [24/99] UBIFS: fix a rare memory leak in ro to rw remounting path

2.6.35-longterm review patch.  If anyone has any objections, please let me know.

------------------
From: Artem Bityutskiy <Artem.Bityutskiy@...ia.com>

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@...ia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
Signed-off-by: Andi Kleen <ak@...ux.intel.com>

---
 fs/ubifs/sb.c    |    3 ++-
 fs/ubifs/super.c |    1 +
 2 files changed, 3 insertions(+), 1 deletion(-)

Index: linux-2.6.35.y/fs/ubifs/sb.c
===================================================================
--- linux-2.6.35.y.orig/fs/ubifs/sb.c
+++ linux-2.6.35.y/fs/ubifs/sb.c
@@ -475,7 +475,8 @@ 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)
 {
Index: linux-2.6.35.y/fs/ubifs/super.c
===================================================================
--- linux-2.6.35.y.orig/fs/ubifs/super.c
+++ linux-2.6.35.y/fs/ubifs/super.c
@@ -1545,6 +1545,7 @@ static int ubifs_remount_rw(struct ubifs
 		}
 		sup->leb_cnt = cpu_to_le32(c->leb_cnt);
 		err = ubifs_write_sb_node(c, sup);
+		kfree(sup);
 		if (err)
 			goto out;
 	}
--
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