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Commit 35122495 authored by Phil Elwell's avatar Phil Elwell Committed by Zhang Rui
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thermal: bcm2835: Fix crash in bcm2835_thermal_debugfs 



"cat /sys/kernel/debug/bcm2835_thermal/regset" causes a NULL pointer
dereference in bcm2835_thermal_debugfs. The driver makes use of the
implementation details of the thermal framework to retrieve a pointer
to its private data from a struct thermal_zone_device, and gets it
wrong - leading to the crash. Instead, store its private data as the
drvdata and retrieve the thermal_zone_device pointer from it.

Fixes: bcb7dd9e ("thermal: bcm2835: add thermal driver for bcm2835 SoC")

Signed-off-by: default avatarPhil Elwell <phil@raspberrypi.org>
Signed-off-by: default avatarZhang Rui <rui.zhang@intel.com>
parent 3b5236cc

drivers/thermal/broadcom/bcm2835_thermal.c

+4 −5
Original line number Diff line number Diff line
@@ -119,8 +119,7 @@ static const struct debugfs_reg32 bcm2835_thermal_regs[] = { 


static void bcm2835_thermal_debugfs(struct platform_device *pdev)

{

	struct thermal_zone_device *tz = platform_get_drvdata(pdev);

	struct bcm2835_thermal_data *data = tz->devdata;

	struct bcm2835_thermal_data *data = platform_get_drvdata(pdev);

	struct debugfs_regset32 *regset;



	data->debugfsdir = debugfs_create_dir("bcm2835_thermal", NULL);
@@ -266,7 +265,7 @@ static int bcm2835_thermal_probe(struct platform_device *pdev) 


	data->tz = tz;



	platform_set_drvdata(pdev, tz);

	platform_set_drvdata(pdev, data);



	/*

	 * Thermal_zone doesn't enable hwmon as default,
@@ -290,8 +289,8 @@ static int bcm2835_thermal_probe(struct platform_device *pdev) 


static int bcm2835_thermal_remove(struct platform_device *pdev)

{

	struct thermal_zone_device *tz = platform_get_drvdata(pdev);

	struct bcm2835_thermal_data *data = tz->devdata;

	struct bcm2835_thermal_data *data = platform_get_drvdata(pdev);

	struct thermal_zone_device *tz = data->tz;



	debugfs_remove_recursive(data->debugfsdir);

	thermal_zone_of_sensor_unregister(&pdev->dev, tz);