linux-kernel - [PATCH 5.4 258/453] s390/cio: fix use-after-free in ccw_device_destroy

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Message-Id: <20201228124949.642068078@linuxfoundation.org>
Date:   Mon, 28 Dec 2020 13:48:14 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Hulk Robot <hulkci@...wei.com>,
        Cornelia Huck <cohuck@...hat.com>,
        Qinglang Miao <miaoqinglang@...wei.com>,
        Vineeth Vijayan <vneethv@...ux.ibm.com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 258/453] s390/cio: fix use-after-free in ccw_device_destroy_console

From: Qinglang Miao <miaoqinglang@...wei.com>

[ Upstream commit 14d4c4fa46eeaa3922e8e1c4aa727eb0a1412804 ]

Use of sch->dev reference after the put_device() call could trigger
the use-after-free bugs.

Fix this by simply adjusting the position of put_device.

Fixes: 37db8985b211 ("s390/cio: add basic protected virtualization support")
Reported-by: Hulk Robot <hulkci@...wei.com>
Suggested-by: Cornelia Huck <cohuck@...hat.com>
Signed-off-by: Qinglang Miao <miaoqinglang@...wei.com>
Reviewed-by: Cornelia Huck <cohuck@...hat.com>
Reviewed-by: Vineeth Vijayan <vneethv@...ux.ibm.com>
[vneethv@...ux.ibm.com: Slight modification in the commit-message]
Signed-off-by: Vineeth Vijayan <vneethv@...ux.ibm.com>
Signed-off-by: Heiko Carstens <hca@...ux.ibm.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/s390/cio/device.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/s390/cio/device.c b/drivers/s390/cio/device.c
index 983f9c9e08deb..23e9227e60fd7 100644
--- a/drivers/s390/cio/device.c
+++ b/drivers/s390/cio/device.c
@@ -1664,10 +1664,10 @@ void __init ccw_device_destroy_console(struct ccw_device *cdev)
 	struct io_subchannel_private *io_priv = to_io_private(sch);
 
 	set_io_private(sch, NULL);
-	put_device(&sch->dev);
-	put_device(&cdev->dev);
 	dma_free_coherent(&sch->dev, sizeof(*io_priv->dma_area),
 			  io_priv->dma_area, io_priv->dma_area_dma);
+	put_device(&sch->dev);
+	put_device(&cdev->dev);
 	kfree(io_priv);
 }
 
-- 
2.27.0