linux-kernel - [PATCH 3.19.y-ckt 128/155] rbd: fix double free on rbd_dev->header

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Message-Id: <1447370309-357-129-git-send-email-kamal@canonical.com>
Date:	Thu, 12 Nov 2015 15:18:02 -0800
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Ilya Dryomov <idryomov@...il.com>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.19.y-ckt 128/155] rbd: fix double free on rbd_dev->header_name

3.19.8-ckt10 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Ilya Dryomov <idryomov@...il.com>

commit 3ebe138ac642a195c7f2efdb918f464734421fd6 upstream.

If rbd_dev_image_probe() in rbd_dev_probe_parent() fails, header_name
is freed twice: once in rbd_dev_probe_parent() and then in its caller
rbd_dev_image_probe() (rbd_dev_image_probe() is called recursively to
handle parent images).

rbd_dev_probe_parent() is responsible for probing the parent, so it
shouldn't muck with clone's fields.

Signed-off-by: Ilya Dryomov <idryomov@...il.com>
Reviewed-by: Alex Elder <elder@...aro.org>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 drivers/block/rbd.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index f33ff6c..d7143de 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -5201,7 +5201,6 @@ static int rbd_dev_probe_parent(struct rbd_device *rbd_dev)
 out_err:
 	if (parent) {
 		rbd_dev_unparent(rbd_dev);
-		kfree(rbd_dev->header_name);
 		rbd_dev_destroy(parent);
 	} else {
 		rbd_put_client(rbdc);
-- 
1.9.1

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