This is a note to let you know that I've just added the patch titled
UBIFS: fix a rare memory leak in ro to rw remounting path
to the 2.6.33-longterm tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/longterm/longterm-queue-2.6.33.git;a=summary
The filename of the patch is:
ubifs-fix-a-rare-memory-leak-in-ro-to-rw-remounting-path.patch
and it can be found in the queue-2.6.33 subdirectory.
If you, or anyone else, feels it should not be added to the 2.6.33 longterm
tree,
please let <[email protected]> know about it.
>From eaeee242c531cd4b0a4a46e8b5dd7ef504380c42 Mon Sep 17 00:00:00 2001
From: Artem Bityutskiy <[email protected]>
Date: Fri, 6 May 2011 17:08:56 +0300
Subject: UBIFS: fix a rare memory leak in ro to rw remounting path
From: Artem Bityutskiy <[email protected]>
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 <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
fs/ubifs/sb.c | 3 ++-
fs/ubifs/super.c | 1 +
2 files changed, 3 insertions(+), 1 deletion(-)
--- 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)
{
--- a/fs/ubifs/super.c
+++ b/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;
}
Patches currently in longterm-queue-2.6.33 which might be from
[email protected] are
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