linux-kernel - [PATCH 4.16 086/279] thermal: int3403_thermal: Fix NULL pointer deref on module load / probe

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Message-Id: <20180618080612.363182728@linuxfoundation.org>
Date:   Mon, 18 Jun 2018 10:11:11 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Hans de Goede <hdegoede@...hat.com>,
        Zhang Rui <rui.zhang@...el.com>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.16 086/279] thermal: int3403_thermal: Fix NULL pointer deref on module load / probe

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

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

From: Hans de Goede <hdegoede@...hat.com>

[ Upstream commit 13b86f50eaaddaea4bdd2fe476fd12e6a0951add ]

Starting with kernel 4.17 thermal_cooling_device_register() will call the
get_max_state() op during register.

Since we deref priv->priv in int3403_get_max_state() this means we must
set priv->priv before calling thermal_cooling_device_register().

Signed-off-by: Hans de Goede <hdegoede@...hat.com>
Signed-off-by: Zhang Rui <rui.zhang@...el.com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/thermal/int340x_thermal/int3403_thermal.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/drivers/thermal/int340x_thermal/int3403_thermal.c
+++ b/drivers/thermal/int340x_thermal/int3403_thermal.c
@@ -194,6 +194,7 @@ static int int3403_cdev_add(struct int34
 		return -EFAULT;
 	}
 
+	priv->priv = obj;
 	obj->max_state = p->package.count - 1;
 	obj->cdev =
 		thermal_cooling_device_register(acpi_device_bid(priv->adev),
@@ -201,8 +202,6 @@ static int int3403_cdev_add(struct int34
 	if (IS_ERR(obj->cdev))
 		result = PTR_ERR(obj->cdev);
 
-	priv->priv = obj;
-
 	kfree(buf.pointer);
 	/* TODO: add ACPI notification support */