linux-kernel - [PATCH 5.4 096/102] platform/chrome: wilco

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Message-Id: <20200124092821.193405865@linuxfoundation.org>
Date:   Fri, 24 Jan 2020 10:31:37 +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, Wen Yang <wenyang@...ux.alibaba.com>,
        Benson Leung <bleung@...omium.org>,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        Nick Crews <ncrews@...omium.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 096/102] platform/chrome: wilco_ec: fix use after free issue

From: Wen Yang <wenyang@...ux.alibaba.com>

[ Upstream commit 856a0a6e2d09d31fd8f00cc1fc6645196a509d56 ]

This is caused by dereferencing 'dev_data' after put_device() in
the telem_device_remove() function.
This patch just moves the put_device() down a bit to avoid this
issue.

Fixes: 1210d1e6bad1 ("platform/chrome: wilco_ec: Add telemetry char device interface")
Signed-off-by: Wen Yang <wenyang@...ux.alibaba.com>
Cc: Benson Leung <bleung@...omium.org>
Cc: Enric Balletbo i Serra <enric.balletbo@...labora.com>
Cc: Nick Crews <ncrews@...omium.org>
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@...labora.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/platform/chrome/wilco_ec/telemetry.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/platform/chrome/wilco_ec/telemetry.c b/drivers/platform/chrome/wilco_ec/telemetry.c
index b9d03c33d8dc1..1176d543191af 100644
--- a/drivers/platform/chrome/wilco_ec/telemetry.c
+++ b/drivers/platform/chrome/wilco_ec/telemetry.c
@@ -406,8 +406,8 @@ static int telem_device_remove(struct platform_device *pdev)
 	struct telem_device_data *dev_data = platform_get_drvdata(pdev);
 
 	cdev_device_del(&dev_data->cdev, &dev_data->dev);
-	put_device(&dev_data->dev);
 	ida_simple_remove(&telem_ida, MINOR(dev_data->dev.devt));
+	put_device(&dev_data->dev);
 
 	return 0;
 }
-- 
2.20.1