linux-kernel - [PATCH 3.12 090/206] dm log userspace: fix memory leak in dm_ulog_tfr

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Date:	Tue, 18 Nov 2014 15:07:25 +0100
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Alexey Khoroshilov <khoroshilov@...ras.ru>,
	Mike Snitzer <snitzer@...hat.com>, Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 090/206] dm log userspace: fix memory leak in dm_ulog_tfr_init failure path

From: Alexey Khoroshilov <khoroshilov@...ras.ru>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit 56ec16cb1e1ce46354de8511eef962a417c32c92 upstream.

If cn_add_callback() fails in dm_ulog_tfr_init(), it does not
deallocate prealloced memory but calls cn_del_callback().

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <khoroshilov@...ras.ru>
Reviewed-by: Jonathan Brassow <jbrassow@...hat.com>
Signed-off-by: Mike Snitzer <snitzer@...hat.com>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 drivers/md/dm-log-userspace-transfer.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/md/dm-log-userspace-transfer.c b/drivers/md/dm-log-userspace-transfer.c
index 08d9a207259a..c69d0b787746 100644
--- a/drivers/md/dm-log-userspace-transfer.c
+++ b/drivers/md/dm-log-userspace-transfer.c
@@ -272,7 +272,7 @@ int dm_ulog_tfr_init(void)
 
 	r = cn_add_callback(&ulog_cn_id, "dmlogusr", cn_ulog_callback);
 	if (r) {
-		cn_del_callback(&ulog_cn_id);
+		kfree(prealloced_cn_msg);
 		return r;
 	}
 
-- 
2.1.3

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